diff --git a/binding.gyp b/binding.gyp
index 78898c6b..a186cf17 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -2,7 +2,7 @@
   "target_defaults": {
     "target_conditions": [
       ["OS != 'win'", {
-        "cflags": ["-fvisibility=hidden", "-msse", "-msse2"]
+        "cflags": ["-fvisibility=hidden"]
       }]
     ]
   },
@@ -15,10 +15,17 @@
         "argon2/src/blake2/blake2b.c",
         "argon2/src/thread.c",
         "argon2/src/encoding.c",
-        "argon2/src/opt.c"
       ],
       "include_dirs": ["argon2/include"],
       "cflags": ["-march=native", "-pthread", "-Wno-type-limits"],
+      "conditions": [
+        ["target_arch == 'ia32' or target_arch == 'x64'", {
+          "cflags+": ["-msse", "-msse2"],
+          "sources+": ["argon2/src/opt.c"]
+        }, {
+          "sources+": ["argon2/src/ref.c"]
+        }]
+      ],
       "type": "static_library"
     }, {
       "target_name": "argon2",