diff --git a/src/regression/inet_pton-invalid-address.c b/src/regression/inet_pton-invalid-address.c
new file mode 100644
index 0000000..7f181f4
--- /dev/null
+++ b/src/regression/inet_pton-invalid-address.c
@@ -0,0 +1,14 @@
+// inet_pton should return 0 on invalid address format
+#include <string.h>
+#include <arpa/inet.h>
+#include "test.h"
+
+int main(void)
+{
+	int r;
+	char addr[16];
+
+	if ((r=inet_pton(AF_INET6, "192.168.1.1", addr)) != 0)
+		t_error("inet_pton(AF_INET6, \"192.168.1.1\", addr) should return 0, got %d\n", r);
+	return t_status;
+}