diff --git a/js/src/ion/MIR.cpp b/js/src/ion/MIR.cpp
index 5fbb4a68bf0..51f0729d49f 100644
--- a/js/src/ion/MIR.cpp
+++ b/js/src/ion/MIR.cpp
@@ -1283,7 +1283,7 @@ MBinaryArithInstruction::infer(BaselineInspector *inspector,
 
     // If the operation will always overflow on its constant operands, use a
     // double specialization so that it can be constant folded later.
-    if (isMul() || isDiv()) {
+    if ((isMul() || isDiv()) && lhs == MIRType_Int32 && rhs == MIRType_Int32) {
         bool typeChange = false;
         EvaluateConstantOperands(this, &typeChange);
         if (typeChange)