diff --git a/stdio-common/tst-printf-bz18872.sh b/stdio-common/tst-printf-bz18872.sh
index 3b283f49a6..ade4b61f85 100644
--- a/stdio-common/tst-printf-bz18872.sh
+++ b/stdio-common/tst-printf-bz18872.sh
@@ -31,7 +31,11 @@ cat <<'EOF'
   Compile do_test without optimization: GCC 4.9/5.0/6.0 takes a long time
   to build this source. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396  */
 
+#ifdef __clang__
+__attribute__ ((optnone))
+#else
 __attribute__ ((optimize ("-O0")))
+#endif
 int do_test (void)
 {
     mtrace ();