diff --git a/plugins/include/core.inc b/plugins/include/core.inc
index 496c66e6..039954a0 100755
--- a/plugins/include/core.inc
+++ b/plugins/include/core.inc
@@ -18,8 +18,6 @@ native numargs();
 native getarg(arg, index=0);
 native setarg(arg, index=0, value);
 
-native strlen(const string[]);
-
 native tolower(c);
 native toupper(c);
 native swapchars(c);