diff --git a/clang/test/Misc/loop-opt-setup.c b/clang/test/Misc/loop-opt-setup.c
--- a/clang/test/Misc/loop-opt-setup.c
+++ b/clang/test/Misc/loop-opt-setup.c
@@ -1,5 +1,5 @@
 // This tests loop unrolling and loop deletion (enabled under -O1)
-// RUN: %clang_cc1 -O1 -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s
+// RUN: %clang_cc1 -std=c11 -O1 -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s
 // RUN: %clang_cc1 -std=c99 -O1 -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s --check-prefix C99
 
 extern int a[16];