diff --git a/banned.h b/banned.h
index 28f5937035b762ad9fb091ea8fb7cc96f38fc92d..447af24807f49f5df4eace6435acba721745fc2c 100644
--- a/banned.h
+++ b/banned.h
@@ -16,6 +16,8 @@
 #define strcat(x,y) BANNED(strcat)
 #undef strncpy
 #define strncpy(x,y,n) BANNED(strncpy)
+#undef strncat
+#define strncat(x,y,n) BANNED(strncat)
 
 #undef sprintf
 #undef vsprintf