diff --git a/5.6/Dockerfile b/5.6/Dockerfile
index b7e3661..3be4978 100644
--- a/5.6/Dockerfile
+++ b/5.6/Dockerfile
@@ -36,7 +36,9 @@ RUN apk add --no-cache \
     php5-xml \
     php5-xmlreader \
     php5-zip \
-    php5-zlib
+    php5-zlib \
+    && apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted \
+    gnu-libiconv
 
 # install and remove building packages
 ENV PHPIZE_DEPS autoconf file g++ gcc libc-dev make pkgconf re2c php5-dev php5-pear \
@@ -63,3 +65,6 @@ ARG VCS_REF
 
 LABEL org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.build-date=$BUILD_DATE
+
+# Fix for iconv: https://github.com/docker-library/php/issues/240
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
diff --git a/5.6/Dockerfile.debug b/5.6/Dockerfile.debug
index 3a72828..eca1f41 100644
--- a/5.6/Dockerfile.debug
+++ b/5.6/Dockerfile.debug
@@ -37,7 +37,9 @@ RUN apk add --no-cache \
     php5-xml \
     php5-xmlreader \
     php5-zip \
-    php5-zlib
+    php5-zlib \
+    && apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted \
+    gnu-libiconv
 
 # install and remove building packages
 ENV PHPIZE_DEPS autoconf file g++ gcc libc-dev make pkgconf re2c php5-dev php5-pear \
@@ -66,3 +68,6 @@ ARG VCS_REF
 
 LABEL org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.build-date=$BUILD_DATE
+
+# Fix for iconv: https://github.com/docker-library/php/issues/240
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
diff --git a/5.6/php5.6.bats b/5.6/php5.6.bats
index d2f6ef0..df1ecfb 100755
--- a/5.6/php5.6.bats
+++ b/5.6/php5.6.bats
@@ -151,3 +151,20 @@ readonly container="graze/php-alpine:5.6"
   [ "$status" -eq 0 ]
   [ "$output" = "memory_limit => 1024M => 1024M" ]
 }
+
+@test "the image uses a fixed iconv module" {
+  run bash -c "docker inspect ${container} | jq -r '.[]?.Config.Env[]'"
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [[ "${output}" == *"LD_PRELOAD=/usr/lib/preloadable_libiconv.so php"* ]]
+}
+
+@test "iconv works" {
+  run docker run ${container} php -r 'echo iconv("UTF-8", "ASCII//TRANSLIT", "foobar");'
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [ "$output" = "foobar" ]
+  [[ "${output}" != *"PHP Notice"* ]]
+}
diff --git a/5.6/php5.6_debug.bats b/5.6/php5.6_debug.bats
index 8211364..fa47551 100755
--- a/5.6/php5.6_debug.bats
+++ b/5.6/php5.6_debug.bats
@@ -152,3 +152,20 @@ readonly container="graze/php-alpine:5.6-test"
   [ "$status" -eq 0 ]
   [ "$output" = "memory_limit => 1024M => 1024M" ]
 }
+
+@test "the image uses a fixed iconv module" {
+  run bash -c "docker inspect ${container} | jq -r '.[]?.Config.Env[]'"
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [[ "${output}" == *"LD_PRELOAD=/usr/lib/preloadable_libiconv.so php"* ]]
+}
+
+@test "iconv works" {
+  run docker run ${container} php -r 'echo iconv("UTF-8", "ASCII//TRANSLIT", "foobar");'
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [ "$output" = "foobar" ]
+  [[ "${output}" != *"PHP Notice"* ]]
+}
diff --git a/7.0/Dockerfile b/7.0/Dockerfile
index 51e6f6a..5d92c48 100644
--- a/7.0/Dockerfile
+++ b/7.0/Dockerfile
@@ -41,7 +41,9 @@ RUN apk add --no-cache \
     php7-xml \
     php7-xmlreader \
     php7-zip \
-    php7-zlib
+    php7-zlib \
+    && apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted \
+    gnu-libiconv
 
 # install and remove building packages
 ENV PHPIZE_DEPS autoconf file g++ gcc libc-dev make pkgconf re2c php7-dev php7-pear \
@@ -72,3 +74,6 @@ ARG VCS_REF
 
 LABEL org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.build-date=$BUILD_DATE
+
+# Fix for iconv: https://github.com/docker-library/php/issues/240
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
diff --git a/7.0/Dockerfile.debug b/7.0/Dockerfile.debug
index 338ae00..f8a436f 100644
--- a/7.0/Dockerfile.debug
+++ b/7.0/Dockerfile.debug
@@ -42,7 +42,9 @@ RUN apk add --no-cache \
     php7-xml \
     php7-xmlreader \
     php7-zip \
-    php7-zlib
+    php7-zlib \
+    && apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted \
+    gnu-libiconv
 
 # install and remove building packages
 ENV PHPIZE_DEPS autoconf file g++ gcc libc-dev make pkgconf re2c php7-dev php7-pear \
@@ -73,3 +75,6 @@ ARG VCS_REF
 
 LABEL org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.build-date=$BUILD_DATE
+
+# Fix for iconv: https://github.com/docker-library/php/issues/240
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
diff --git a/7.0/php7.0.bats b/7.0/php7.0.bats
index d1a096b..a58c236 100755
--- a/7.0/php7.0.bats
+++ b/7.0/php7.0.bats
@@ -151,3 +151,20 @@ readonly container="graze/php-alpine:7.0"
   [ "$status" -eq 0 ]
   [ "$output" = "memory_limit => 1024M => 1024M" ]
 }
+
+@test "the image uses a fixed iconv module" {
+  run bash -c "docker inspect ${container} | jq -r '.[]?.Config.Env[]'"
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [[ "${output}" == *"LD_PRELOAD=/usr/lib/preloadable_libiconv.so php"* ]]
+}
+
+@test "iconv works" {
+  run docker run ${container} php -r 'echo iconv("UTF-8", "ASCII//TRANSLIT", "foobar");'
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [ "$output" = "foobar" ]
+  [[ "${output}" != *"PHP Notice"* ]]
+}
diff --git a/7.0/php7.0_debug.bats b/7.0/php7.0_debug.bats
index f1d9926..c110a79 100755
--- a/7.0/php7.0_debug.bats
+++ b/7.0/php7.0_debug.bats
@@ -159,3 +159,20 @@ readonly container="graze/php-alpine:7.0-test"
   [ "$status" -eq 0 ]
   [ "$output" = "memory_limit => 1024M => 1024M" ]
 }
+
+@test "the image uses a fixed iconv module" {
+  run bash -c "docker inspect ${container} | jq -r '.[]?.Config.Env[]'"
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [[ "${output}" == *"LD_PRELOAD=/usr/lib/preloadable_libiconv.so php"* ]]
+}
+
+@test "iconv works" {
+  run docker run ${container} php -r 'echo iconv("UTF-8", "ASCII//TRANSLIT", "foobar");'
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [ "$output" = "foobar" ]
+  [[ "${output}" != *"PHP Notice"* ]]
+}
diff --git a/7.1/Dockerfile b/7.1/Dockerfile
index ea13bac..671ba56 100644
--- a/7.1/Dockerfile
+++ b/7.1/Dockerfile
@@ -46,7 +46,9 @@ RUN apk add --no-cache \
     php7-xmlreader \
     php7-xmlwriter \
     php7-zip \
-    php7-zlib
+    php7-zlib \
+    && apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted \
+    gnu-libiconv
 
 # install and remove building packages
 ENV PHPIZE_DEPS autoconf file g++ gcc libc-dev make pkgconf re2c php7-dev php7-pear \
@@ -73,3 +75,6 @@ ARG VCS_REF
 
 LABEL org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.build-date=$BUILD_DATE
+
+# Fix for iconv: https://github.com/docker-library/php/issues/240
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
diff --git a/7.1/Dockerfile.debug b/7.1/Dockerfile.debug
index 8a67656..81a52bc 100644
--- a/7.1/Dockerfile.debug
+++ b/7.1/Dockerfile.debug
@@ -47,7 +47,9 @@ RUN apk add --no-cache \
     php7-xmlreader \
     php7-xmlwriter \
     php7-zip \
-    php7-zlib
+    php7-zlib \
+    && apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted \
+    gnu-libiconv
 
 # install and remove building packages
 ENV PHPIZE_DEPS autoconf file g++ gcc libc-dev make pkgconf re2c php7-dev php7-pear \
@@ -74,3 +76,6 @@ ARG VCS_REF
 
 LABEL org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.build-date=$BUILD_DATE
+
+# Fix for iconv: https://github.com/docker-library/php/issues/240
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
diff --git a/7.1/php7.1.bats b/7.1/php7.1.bats
index 30e37d0..ae5dc16 100755
--- a/7.1/php7.1.bats
+++ b/7.1/php7.1.bats
@@ -151,3 +151,20 @@ readonly container="graze/php-alpine:7.1"
   [ "$status" -eq 0 ]
   [ "$output" = "memory_limit => 1024M => 1024M" ]
 }
+
+@test "the image uses a fixed iconv module" {
+  run bash -c "docker inspect ${container} | jq -r '.[]?.Config.Env[]'"
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [[ "${output}" == *"LD_PRELOAD=/usr/lib/preloadable_libiconv.so php"* ]]
+}
+
+@test "iconv works" {
+  run docker run ${container} php -r 'echo iconv("UTF-8", "ASCII//TRANSLIT", "foobar");'
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [ "$output" = "foobar" ]
+  [[ "${output}" != *"PHP Notice"* ]]
+}
diff --git a/7.1/php7.1_debug.bats b/7.1/php7.1_debug.bats
index d3326a0..b09fd5c 100755
--- a/7.1/php7.1_debug.bats
+++ b/7.1/php7.1_debug.bats
@@ -159,3 +159,20 @@ readonly container="graze/php-alpine:7.1-test"
   [ "$status" -eq 0 ]
   [ "$output" = "memory_limit => 1024M => 1024M" ]
 }
+
+@test "the image uses a fixed iconv module" {
+  run bash -c "docker inspect ${container} | jq -r '.[]?.Config.Env[]'"
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [[ "${output}" == *"LD_PRELOAD=/usr/lib/preloadable_libiconv.so php"* ]]
+}
+
+@test "iconv works" {
+  run docker run ${container} php -r 'echo iconv("UTF-8", "ASCII//TRANSLIT", "foobar");'
+  echo "status: $status"
+  echo "output: $output"
+  [ "$status" -eq 0 ]
+  [ "$output" = "foobar" ]
+  [[ "${output}" != *"PHP Notice"* ]]
+}