diff --git a/tests/unit/unit2604.c b/tests/unit/unit2604.c
index 3002d84ec0..baa8ecb445 100644
--- a/tests/unit/unit2604.c
+++ b/tests/unit/unit2604.c
@@ -81,7 +81,7 @@ static CURLcode test_unit2604(const char *arg)
     const char *cp;
     CURLcode result;
     if(i == 0) {
-      cp0 = calloc(1, too_long + 1);
+      cp0 = malloc(too_long + 1);
       fail_unless(cp0, "could not alloc too long value");
       memset(cp0, 'a', too_long);
       cp = cp0;