diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index e625606663..6e0b4a7040 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -1939,7 +1939,7 @@ void MacroAssembler::AllocateAsciiConsString(Register result,
   ExternalReference high_promotion_mode = ExternalReference::
       new_space_high_promotion_mode_active_address(isolate());
   mov(scratch1, Operand(high_promotion_mode));
-  ldr(scratch1, MemOperand(r4, 0));
+  ldr(scratch1, MemOperand(scratch1, 0));
   cmp(scratch1, Operand::Zero());
   b(eq, &allocate_new_space);