diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp
index 54dc6e6148e..16cdfeb838f 100644
--- a/lib/Analysis/InstructionSimplify.cpp
+++ b/lib/Analysis/InstructionSimplify.cpp
@@ -795,7 +795,7 @@ static Value *SimplifyDiv(unsigned Opcode, Value *Op0, Value *Op1,
   Value *X = 0, *Y = 0;
   if (match(Op0, m_Mul(m_Value(X), m_Value(Y))) && (X == Op1 || Y == Op1)) {
     if (Y != Op1) std::swap(X, Y); // Ensure expression is (X * Y) / Y, Y = Op1
-    BinaryOperator *Mul = dyn_cast<BinaryOperator>(Op0);
+    BinaryOperator *Mul = cast<BinaryOperator>(Op0);
     // If the Mul knows it does not overflow, then we are good to go.
     if ((isSigned && Mul->hasNoSignedWrap()) ||
         (!isSigned && Mul->hasNoUnsignedWrap()))