diff --git a/src/lib/src/fwts_framework.c b/src/lib/src/fwts_framework.c
index 927ee54..aa26d4b 100644
--- a/src/lib/src/fwts_framework.c
+++ b/src/lib/src/fwts_framework.c
@@ -287,7 +287,7 @@ static void fwts_framework_show_tests(fwts_framework *fw, bool full)
  *  fwts_framework_strtrunc()
  *	truncate overlong string
  */
-static void fwts_framework_strtrunc(char *dest, const char *src, int max)
+static void fwts_framework_strtrunc(char *dest, const char *src, size_t max)
 {
 	strncpy(dest, src, max);