diff --git a/util/ck_errf.pl b/util/ck_errf.pl
index 1a8665ab6..922e5f644 100755
--- a/util/ck_errf.pl
+++ b/util/ck_errf.pl
@@ -21,7 +21,7 @@ foreach $file (@ARGV)
 	$func="";
 	while (<IN>)
 		{
-		if (!/;$/ && /^\**([a-zA-Z].*[\s*])?([A-Za-z_0-9]+)\(.*([),]|$)/)
+		if (!/;$/ && /^\**([a-zA-Z_].*[\s*])?([A-Za-z_0-9]+)\(.*([),]|$)/)
 			{
 			/^([^()]*(\([^()]*\)[^()]*)*)\(/;
 			$1 =~ /([A-Za-z_0-9]*)$/;