diff --git a/ares/m4/cares-compilers.m4 b/ares/m4/cares-compilers.m4
index 5d7f0e5ebd0e14ce80f8d636c9bdf78b8f1340ca..a54f33688460199436e7da117173f4b724c18b2e 100644
--- a/ares/m4/cares-compilers.m4
+++ b/ares/m4/cares-compilers.m4
@@ -940,7 +940,7 @@ AC_DEFUN([CARES_SET_COMPILER_WARNING_OPTS], [
         #
         if test "$want_warnings" = "yes"; then
           dnl Issue all warnings
-          dnl tmp_CFLAGS="$tmp_CFLAGS -Wall -Wextra -Wpadded"
+          tmp_CFLAGS="$tmp_CFLAGS -Wall -Wextra -Wpadded"
         fi
         ;;
         #
diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 03d35cdf4a0b95d342d2a44bd93770d230c48f47..52f30b1226b4b7dd85470afc66eeb444205e84ae 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -946,7 +946,7 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
         #
         if test "$want_warnings" = "yes"; then
           dnl Issue all warnings
-          dnl tmp_CFLAGS="$tmp_CFLAGS -Wall -Wextra -Wpadded"
+          tmp_CFLAGS="$tmp_CFLAGS -Wall -Wextra -Wpadded"
         fi
         ;;
         #