diff --git a/src/core/wee-string.c b/src/core/wee-string.c
index f0566bf2f..f514f55f0 100644
--- a/src/core/wee-string.c
+++ b/src/core/wee-string.c
@@ -82,7 +82,7 @@ string_strndup (const char *string, int bytes)
     if (!string || (bytes < 0))
         return NULL;
 
-    if ((int)strlen (string) < bytes)
+    if ((int)strlen (string) <= bytes)
         return strdup (string);
 
     result = malloc (bytes + 1);