diff --git a/build/php.m4 b/build/php.m4
index b827679b3e6..0d0fb61fbe5 100644
--- a/build/php.m4
+++ b/build/php.m4
@@ -305,7 +305,7 @@ fi
 ])
 
 AC_DEFUN([PHP_CHECK_GCC_ARG],[
-  AC_MSG_ERROR([Use AX_CHECK_COMPILE_FLAG instead])
+  AC_MSG_ERROR([[Use AX_CHECK_COMPILE_FLAG instead]])
 ])
 
 dnl