diff --git a/acinclude.m4 b/acinclude.m4
index 08f2a43b8..4a9be7a1a 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -673,7 +673,7 @@ AC_DEFUN([CURL_CC_DEBUG_OPTS],
          dnl * 1419 warns on "external declaration in primary source file"
          dnl   which we know and do on purpose.
 
-         WARN="-wd279,269,981,1418,1419
+         WARN="-wd279,269,981,1418,1419"
 
          if test "$gccnum" -gt "600"; then
             dnl icc 6.0 and older doesn't have the -Wall flag