diff --git a/c/zalloc_ext/zalloc_ext_test.c b/c/zalloc_ext/zalloc_ext_test.c
index 07d82f9..06d4a99 100644
--- a/c/zalloc_ext/zalloc_ext_test.c
+++ b/c/zalloc_ext/zalloc_ext_test.c
@@ -9,10 +9,16 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "zalloc_ext.h"
+
 #include "zalloc.h"
 
 int main(int argc, char *argv[])
 {
+zalloc_append(0, NULL);
+zalloc_append8(0, 0);
+
+
 	if (argc != 3) {
 		fputs("Usage: realloc_speed_test_cpp iterations nobj\n", stderr);
 		exit(-1);