diff --git a/test/Index/c-index-api-test.m b/test/Index/c-index-api-test.m
index ac9ed92..ada5236 100644
--- a/test/Index/c-index-api-test.m
+++ b/test/Index/c-index-api-test.m
@@ -1,4 +1,4 @@
-// RUN: clang-cc -fobjc-nonfragile-abi -fblocks -emit-pch -x objective-c %s -o %t.ast
+// RUN: clang-cc -triple x86_64-apple-darwin10 -fobjc-nonfragile-abi -fblocks -emit-pch -x objective-c %s -o %t.ast
 // RUN: c-index-test %t.ast all | FileCheck %s
 
 // CHECK: <invalid loc>:0:0: TypedefDecl=__int128_t:0:0 [Context=c-index-api-test.m]