diff --git a/tests/stdio_test.cpp b/tests/stdio_test.cpp
index 8c1cef9..cc1fd85 100644
--- a/tests/stdio_test.cpp
+++ b/tests/stdio_test.cpp
@@ -297,6 +297,9 @@
 
   snprintf(buf, sizeof(buf), "a_%g_b", 3.14);
   EXPECT_STREQ("a_3.14_b", buf);
+
+  snprintf(buf, sizeof(buf), "%1$s %1$s", "print_me_twice");
+  EXPECT_STREQ("print_me_twice print_me_twice", buf);
 }
 
 TEST(stdio, snprintf_d_INT_MAX) {