diff --git a/src/core/misc.c b/src/core/misc.c
index 4219a36c..af83cb14 100644
--- a/src/core/misc.c
+++ b/src/core/misc.c
@@ -42,7 +42,7 @@ int inet_aton ( const char *cp, struct in_addr *inp ) {
 	return 0;
 }
 
-int isspace ( int c ) {
+static int isspace ( int c ) {
 	switch ( c ) {
 	case ' ':
 	case '\f':