diff --git a/m4/prereq.m4 b/m4/prereq.m4
index 703cec4..d850b3f 100644
--- a/m4/prereq.m4
+++ b/m4/prereq.m4
@@ -57,7 +57,7 @@ AC_DEFUN([jm_PREREQ_DIRNAME],
 
 AC_DEFUN([jm_PREREQ_EXCLUDE],
 [
-  AC_FUNC_FNMATCH_GNU([lib])
+  AC_FUNC_FNMATCH_GNU
   AC_HEADER_STDBOOL
 ])