diff --git a/dap_test.h b/dap_test.h
index 929604f495ac0a0b2c8300326f52d80c3fa599e8..0c346732faf6f13ae2d744601ee77f1156693b3b 100755
--- a/dap_test.h
+++ b/dap_test.h
@@ -65,7 +65,7 @@
     fflush(stdout); }
 
 #define dap_str_equals(str1, str2) strcmp(str1, str2) == 0
-
+#define dap_strn_equals(str1, str2, count) strncmp(str1, str2, count) == 0
 
 /*
  How to use benchmark_xxx() functions: