diff --git a/js/src/ion/arm/MacroAssembler-arm.h b/js/src/ion/arm/MacroAssembler-arm.h
index 0a18278ffba..9c1ad077465 100644
--- a/js/src/ion/arm/MacroAssembler-arm.h
+++ b/js/src/ion/arm/MacroAssembler-arm.h
@@ -706,7 +706,7 @@ class MacroAssemblerARMCompat : public MacroAssemblerARM
         jsval_layout jv = JSVAL_TO_IMPL(val);
         ma_mov(Imm32(jv.s.tag), lr);
         ma_str(lr, Address(dest.base, dest.offset + 4));
-        if (val.isGCThing())
+        if (val.isMarkable())
             ma_mov(ImmGCPtr(reinterpret_cast<gc::Cell *>(val.toGCThing())), lr);
         else
             ma_mov(Imm32(jv.s.payload.i32), lr);
@@ -728,7 +728,7 @@ class MacroAssemblerARMCompat : public MacroAssemblerARM
     void pushValue(const Value &val) {
         jsval_layout jv = JSVAL_TO_IMPL(val);
         push(Imm32(jv.s.tag));
-        if (val.isGCThing())
+        if (val.isMarkable())
             push(ImmGCPtr(reinterpret_cast<gc::Cell *>(val.toGCThing())));
         else
             push(Imm32(jv.s.payload.i32));
diff --git a/js/src/ion/x86/MacroAssembler-x86.h b/js/src/ion/x86/MacroAssembler-x86.h
index 815d552b062..a15c08a7498 100644
--- a/js/src/ion/x86/MacroAssembler-x86.h
+++ b/js/src/ion/x86/MacroAssembler-x86.h
@@ -121,7 +121,7 @@ class MacroAssemblerX86 : public MacroAssemblerX86Shared
     void moveValue(const Value &val, Register type, Register data) {
         jsval_layout jv = JSVAL_TO_IMPL(val);
         movl(Imm32(jv.s.tag), type);
-        if (val.isGCThing())
+        if (val.isMarkable())
             movl(ImmGCPtr(reinterpret_cast<gc::Cell *>(val.toGCThing())), data);
         else
             movl(Imm32(jv.s.payload.i32), data);
@@ -183,7 +183,7 @@ class MacroAssemblerX86 : public MacroAssemblerX86Shared
     void pushValue(const Value &val) {
         jsval_layout jv = JSVAL_TO_IMPL(val);
         push(Imm32(jv.s.tag));
-        if (val.isGCThing())
+        if (val.isMarkable())
             push(ImmGCPtr(reinterpret_cast<gc::Cell *>(val.toGCThing())));
         else
             push(Imm32(jv.s.payload.i32));