diff --git a/js/src/jit/MIR.cpp b/js/src/jit/MIR.cpp
index f15de7870..c9d1118cd 100644
--- a/js/src/jit/MIR.cpp
+++ b/js/src/jit/MIR.cpp
@@ -5356,15 +5356,6 @@ PrototypeHasIndexedProperty(IonBuilder* builder, JSObject* obj)
     return false;
 }
 
-// Whether Array.prototype, or an object on its proto chain, has an indexed property.
-bool
-jit::ArrayPrototypeHasIndexedProperty(IonBuilder* builder, JSScript* script)
-{
-    if (JSObject* proto = script->global().maybeGetArrayPrototype())
-        return PrototypeHasIndexedProperty(builder, proto);
-    return true;
-}
-
 // Whether obj or any of its prototypes have an indexed property.
 bool
 jit::TypeCanHaveExtraIndexedProperties(IonBuilder* builder, TemporaryTypeSet* types)
diff --git a/js/src/jit/MIR.h b/js/src/jit/MIR.h
index d1d068acc..030688813 100644
--- a/js/src/jit/MIR.h
+++ b/js/src/jit/MIR.h
@@ -14114,7 +14114,6 @@ bool PropertyWriteNeedsTypeBarrier(TempAllocator& alloc, CompilerConstraintList*
                                    MBasicBlock* current, MDefinition** pobj,
                                    PropertyName* name, MDefinition** pvalue,
                                    bool canModify, MIRType implicitType = MIRType_None);
-bool ArrayPrototypeHasIndexedProperty(IonBuilder* builder, JSScript* script);
 bool TypeCanHaveExtraIndexedProperties(IonBuilder* builder, TemporaryTypeSet* types);
 
 inline MIRType