diff --git a/src/builtins/arm/builtins-arm.cc b/src/builtins/arm/builtins-arm.cc
index e93fc85878..f6ed3a23e8 100644
--- a/src/builtins/arm/builtins-arm.cc
+++ b/src/builtins/arm/builtins-arm.cc
@@ -1867,7 +1867,7 @@ void OnStackReplacement(MacroAssembler* masm, OsrSourceTier source,
   {
     Label next;
     __ Move(r1, ExternalReference::address_of_FLAG_trace_osr());
-    __ ldr(r1, MemOperand(r1));
+    __ ldrsb(r1, MemOperand(r1));
     __ tst(r1, Operand(0xFF));  // Mask to the LSB.
     __ b(eq, &next);
 
diff --git a/src/builtins/arm64/builtins-arm64.cc b/src/builtins/arm64/builtins-arm64.cc
index 2cb666aad6..35cf34afc0 100644
--- a/src/builtins/arm64/builtins-arm64.cc
+++ b/src/builtins/arm64/builtins-arm64.cc
@@ -2101,7 +2101,7 @@ void OnStackReplacement(MacroAssembler* masm, OsrSourceTier source,
   {
     Label next;
     __ Mov(x1, ExternalReference::address_of_FLAG_trace_osr());
-    __ Ldr(x1, MemOperand(x1));
+    __ Ldrsb(x1, MemOperand(x1));
     __ Tst(x1, 0xFF);  // Mask to the LSB.
     __ B(eq, &next);