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-rw-r--r--test/testutil/main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/testutil/main.c b/test/testutil/main.c
index 458d4805f3..9dc651b61b 100644
--- a/test/testutil/main.c
+++ b/test/testutil/main.c
@@ -25,7 +25,7 @@ static void check_arg_usage(void)
for (i = 0; i < n; i++)
if (!arg_used[i+1])
- test_printf_stderr("Warning ignored command-line argument %d: %s\n",
+ test_printf_stderr("Warning ignored command-line argument %zu: %s\n",
i, args[i+1]);
if (i < arg_count)
test_printf_stderr("Warning arguments %zu and later unchecked\n", i);