diff --git a/test/CFrontend/cast-to-bool.c b/test/CFrontend/cast-to-bool.c
index e0f48daa731..04e174e46eb 100644
--- a/test/CFrontend/cast-to-bool.c
+++ b/test/CFrontend/cast-to-bool.c
@@ -1,5 +1,5 @@
 // RUN: %llvmgcc -S %s -o - | grep 'trunc.*to bool'
-// RUN: %llvmgcc -S %s -o - | llvm-as | llc -march=x86 | grep 'test.*1'
+// RUN: %llvmgcc -S %s -o - | llvm-as | opt -instcombine | llc -march=x86 | grep 'test.*1'
 int
 main ( int argc, char** argv)
 {