diff --git a/public/crtlib.c b/public/crtlib.c
index bec512d2..2360026f 100644
--- a/public/crtlib.c
+++ b/public/crtlib.c
@@ -60,7 +60,7 @@ qboolean Q_isdigit( const char *str )
 	return false;
 }
 
-int Q_strlen( const char *string )
+size_t Q_strlen( const char *string )
 {
 	int		len;
 	const char	*p;
diff --git a/public/crtlib.h b/public/crtlib.h
index 22939aba..9bc7a2d1 100644
--- a/public/crtlib.h
+++ b/public/crtlib.h
@@ -45,7 +45,7 @@ enum
 void Q_strnupr( const char *in, char *out, size_t size_out );
 #define Q_strlwr( in, out ) Q_strnlwr( in, out, 99999 )
 void Q_strnlwr( const char *in, char *out, size_t size_out );
-int Q_strlen( const char *string );
+size_t Q_strlen( const char *string );
 int Q_colorstr( const char *string );
 char Q_toupper( const char in );
 char Q_tolower( const char in );