diff --git a/llvm/lib/Transforms/Scalar/LoopPassManager.cpp b/llvm/lib/Transforms/Scalar/LoopPassManager.cpp
--- a/llvm/lib/Transforms/Scalar/LoopPassManager.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopPassManager.cpp
@@ -14,6 +14,7 @@
 #include "llvm/Analysis/MemorySSA.h"
 #include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/TimeProfiler.h"
 
 using namespace llvm;
@@ -297,7 +298,7 @@
     // queries. See PR44815.
     LAR.DT.verify();
     LAR.LI.verify(LAR.DT);
-    if (LAR.MSSA)
+    if (LAR.MSSA && VerifyMemorySSA)
       LAR.MSSA->verifyMemorySSA();
 #endif