diff --git a/src/builtins/ppc/builtins-ppc.cc b/src/builtins/ppc/builtins-ppc.cc
index 7ffa9f1f0312..e033c7ee5572 100644
--- a/src/builtins/ppc/builtins-ppc.cc
+++ b/src/builtins/ppc/builtins-ppc.cc
@@ -823,7 +823,6 @@ static void MaybeTailCallOptimizedCodeSlot(MacroAssembler* masm,
     static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
     __ addi(r5, optimized_code_entry,
             Operand(Code::kHeaderSize - kHeapObjectTag));
-    __ mr(ip, r5);
     __ Jump(r5);
 
     // Optimized code slot contains deoptimized code, evict it and re-enter the
diff --git a/src/s390/macro-assembler-s390.cc b/src/s390/macro-assembler-s390.cc
index a82e3a6c4823..aa6d0aadc9ee 100644
--- a/src/s390/macro-assembler-s390.cc
+++ b/src/s390/macro-assembler-s390.cc
@@ -161,7 +161,7 @@ void TurboAssembler::Call(Register target) {
 }
 
 void MacroAssembler::CallJSEntry(Register target) {
-  DCHECK(target == ip);
+  DCHECK(target == r4);
   Call(target);
 }