--- a/tools/profiler/sps_sampler.h
+++ b/tools/profiler/sps_sampler.h
@@ -252,28 +252,28 @@ private:
 class StackEntry : public js::ProfileEntry
 {
 public:
 
   bool isCopyLabel() volatile {
     return !((uintptr_t)stackAddress() & 0x1);
   }
 
-  void setStackAddressCopy(void *sp, bool copy) volatile {
+  void setStackAddressCopy(void *sparg, bool copy) volatile {
     // Tagged pointer. Less significant bit used to track if mLabel needs a
     // copy. Note that we don't need the last bit of the stack address for
     // proper ordering. This is optimized for encoding within the JS engine's
     // instrumentation, so we do the extra work here of encoding a bit.
     // Last bit 1 = Don't copy, Last bit 0 = Copy.
     if (copy) {
       setStackAddress(reinterpret_cast<void*>(
-                        reinterpret_cast<uintptr_t>(sp) & ~0x1));
+                        reinterpret_cast<uintptr_t>(sparg) & ~0x1));
     } else {
       setStackAddress(reinterpret_cast<void*>(
-                        reinterpret_cast<uintptr_t>(sp) | 0x1));
+                        reinterpret_cast<uintptr_t>(sparg) | 0x1));
     }
   }
 };
 
 // the SamplerStack members are read by signal
 // handlers, so the mutation of them needs to be signal-safe.
 struct ProfileStack
 {