diff --git a/js/src/jit/IonBuilder.cpp b/js/src/jit/IonBuilder.cpp
index 8d905adb8c8..080b9794d39 100644
--- a/js/src/jit/IonBuilder.cpp
+++ b/js/src/jit/IonBuilder.cpp
@@ -8937,8 +8937,6 @@ IonBuilder::jsop_typeof()
     current->add(ins);
     current->push(ins);
 
-    if (ins->isEffectful() && !resumeAfter(ins))
-        return false;
     return true;
 }
 
diff --git a/js/src/jit/MIR.h b/js/src/jit/MIR.h
index 09c91140e28..0db80ebaac5 100644
--- a/js/src/jit/MIR.h
+++ b/js/src/jit/MIR.h
@@ -2919,11 +2919,7 @@ class MTypeOf
     MDefinition *foldsTo(bool useValueNumbers);
 
     AliasSet getAliasSet() const {
-        if (inputType_ <= MIRType_String)
-            return AliasSet::None();
-
-        // For objects, typeof may invoke an effectful typeof hook.
-        return AliasSet::Store(AliasSet::Any);
+        return AliasSet::None();
     }
 };