diff --git a/Tests/Conformance/C15.1.0.1.CC b/Tests/Conformance/C15.1.0.1.CC
index 3cdc9eb..1800a02 100644
--- a/Tests/Conformance/C15.1.0.1.CC
+++ b/Tests/Conformance/C15.1.0.1.CC
@@ -34,7 +34,7 @@ second string argument!"))
        goto Fail;
 
    strcpy(s1, "this is the first string argument");
-   strcpy(s1, strncat (s1, s2, -5));
+   strcpy(s1, strncat (s1, s2, 0));
    if (strcmp (s1, "this is the first string argument"))
        goto Fail;
 
diff --git a/Tests/Conformance/C15.2.0.1.CC b/Tests/Conformance/C15.2.0.1.CC
index 6ba0391..2984994 100644
--- a/Tests/Conformance/C15.2.0.1.CC
+++ b/Tests/Conformance/C15.2.0.1.CC
@@ -29,7 +29,7 @@ int main (void)
    if (i != 0)
        goto Fail;
 
-   i = strncmp (s1, s2, -90L);         /* should just return 0 */
+   i = strncmp (s1, s2, 0L);           /* should just return 0 */
    if (i != 0)
        goto Fail;