diff --git a/test/Transforms/GlobalDCE/complex-constantexpr.ll b/test/Transforms/GlobalDCE/complex-constantexpr.ll
index 2978704ddf2..4bf1aeee709 100644
--- a/test/Transforms/GlobalDCE/complex-constantexpr.ll
+++ b/test/Transforms/GlobalDCE/complex-constantexpr.ll
@@ -1,4 +1,4 @@
-; RUN: opt -globaldce -disable-output < %s
+; RUN: opt -O2 -disable-output < %s
 ; PR15714
 
 %struct.ham = type { i32 }
diff --git a/test/Transforms/PhaseOrdering/scev.ll b/test/Transforms/PhaseOrdering/scev.ll
index c3b71943f81..39adb6b73d3 100644
--- a/test/Transforms/PhaseOrdering/scev.ll
+++ b/test/Transforms/PhaseOrdering/scev.ll
@@ -1,4 +1,4 @@
-; RUN: opt -S -analyze -scalar-evolution < %s | FileCheck %s
+; RUN: opt -O3 -S -analyze -scalar-evolution < %s | FileCheck %s
 ;
 ; This file contains phase ordering tests for scalar evolution.
 ; Test that the standard passes don't obfuscate the IR so scalar evolution can't