diff --git a/src/test/ui/parser/raw-byte-string-eof.stderr b/src/test/ui/parser/raw-byte-string-eof.stderr
index 65fa89f2a81ac..16a953606306b 100644
--- a/src/test/ui/parser/raw-byte-string-eof.stderr
+++ b/src/test/ui/parser/raw-byte-string-eof.stderr
@@ -1,4 +1,4 @@
-error: unterminated raw string
+error[E0744]: unterminated raw string
   --> $DIR/raw-byte-string-eof.rs:2:5
    |
 LL |     br##"a"#;
@@ -8,3 +8,4 @@ LL |     br##"a"#;
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0744`.
diff --git a/src/test/ui/parser/raw-str-unterminated.stderr b/src/test/ui/parser/raw-str-unterminated.stderr
index 67792eb91e5ca..d3c7cc18b63a0 100644
--- a/src/test/ui/parser/raw-str-unterminated.stderr
+++ b/src/test/ui/parser/raw-str-unterminated.stderr
@@ -1,4 +1,4 @@
-error: unterminated raw string
+error[E0744]: unterminated raw string
   --> $DIR/raw-str-unterminated.rs:2:5
    |
 LL |     r#" string literal goes on
@@ -8,3 +8,4 @@ LL |     r#" string literal goes on
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0744`.
diff --git a/src/test/ui/parser/raw/raw_string.stderr b/src/test/ui/parser/raw/raw_string.stderr
index 5572511881d57..e192d07909e48 100644
--- a/src/test/ui/parser/raw/raw_string.stderr
+++ b/src/test/ui/parser/raw/raw_string.stderr
@@ -1,4 +1,4 @@
-error: unterminated raw string
+error[E0744]: unterminated raw string
   --> $DIR/raw_string.rs:2:13
    |
 LL |     let x = r##"lol"#;
@@ -8,3 +8,4 @@ LL |     let x = r##"lol"#;
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0744`.