diff --git a/m4/curl-functions.m4 b/m4/curl-functions.m4
index a7cf327f95d209d11f060b28768ed5e60456e7c9..f2dd1e41fb9ff85f9d8208a1372c57ca1391f0bb 100644
--- a/m4/curl-functions.m4
+++ b/m4/curl-functions.m4
@@ -22,7 +22,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 25
+# serial 26
 
 
 dnl CURL_INCLUDES_ARPA_INET
@@ -2692,7 +2692,7 @@ AC_DEFUN([CURL_CHECK_FUNC_STRERROR_R], [
   #
   if test "$tst_compi_strerror_r" = "yes" &&
      test "$tst_allow_strerror_r" = "unknown"; then
-    AC_MSG_NOTICE([cannot determine strerror_r() style: edit lib/config.h manually.])
+    AC_MSG_WARN([cannot determine strerror_r() style: edit lib/config.h manually.])
   fi
   #
 ])