diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index 09e71817033..48710f715e0 100644
--- a/lib/Analysis/ValueTracking.cpp
+++ b/lib/Analysis/ValueTracking.cpp
@@ -485,12 +485,12 @@ static void computeKnownBitsFromAssume(Value *V, APInt &KnownZero,
 
   unsigned BitWidth = KnownZero.getBitWidth();
 
-  Function *F = const_cast<Function*>(Q.CxtI->getParent()->getParent());
   for (auto &AssumeVH : Q.AC->assumptions()) {
     if (!AssumeVH)
       continue;
     CallInst *I = cast<CallInst>(AssumeVH);
-    assert(I->getParent()->getParent() == F &&
+    assert((I->getParent()->getParent() == 
+            const_cast<Function*>(Q.CxtI->getParent()->getParent())) &&
            "Got assumption for the wrong function!");
     if (Q.ExclInvs.count(I))
       continue;