diff --git a/renderdoc/os/os_specific.h b/renderdoc/os/os_specific.h
index b70feae00..b3961241a 100644
--- a/renderdoc/os/os_specific.h
+++ b/renderdoc/os/os_specific.h
@@ -204,7 +204,7 @@ int32_t Dec32(volatile int32_t *i);
 int64_t Inc64(volatile int64_t *i);
 int64_t Dec64(volatile int64_t *i);
 int64_t ExchAdd64(volatile int64_t *i, int64_t a);
-int32_t CmpExch32(volatile int32_t *dest, int32_t exch, int32_t comp);
+int32_t CmpExch32(volatile int32_t *dest, int32_t oldVal, int32_t newVal);
 };
 
 namespace Callstack
diff --git a/renderdoc/os/posix/posix_threading.cpp b/renderdoc/os/posix/posix_threading.cpp
index bc915391b..96c15f973 100644
--- a/renderdoc/os/posix/posix_threading.cpp
+++ b/renderdoc/os/posix/posix_threading.cpp
@@ -60,9 +60,9 @@ int64_t ExchAdd64(volatile int64_t *i, int64_t a)
   return __sync_add_and_fetch(i, int64_t(a));
 }
 
-int32_t CmpExch32(volatile int32_t *dest, int32_t exch, int32_t comp)
+int32_t CmpExch32(volatile int32_t *dest, int32_t oldVal, int32_t newVal)
 {
-  return __sync_val_compare_and_swap(dest, comp, exch);
+  return __sync_val_compare_and_swap(dest, oldVal, newVal);
 }
 };
 
diff --git a/renderdoc/os/win32/win32_threading.cpp b/renderdoc/os/win32/win32_threading.cpp
index 946be7192..451ed3a68 100644
--- a/renderdoc/os/win32/win32_threading.cpp
+++ b/renderdoc/os/win32/win32_threading.cpp
@@ -73,9 +73,9 @@ int64_t ExchAdd64(volatile int64_t *i, int64_t a)
   return (int64_t)InterlockedExchangeAdd64((volatile LONG64 *)i, a);
 }
 
-int32_t CmpExch32(volatile int32_t *dest, int32_t exch, int32_t comp)
+int32_t CmpExch32(volatile int32_t *dest, int32_t oldVal, int32_t newVal)
 {
-  return (int32_t)InterlockedCompareExchange((volatile LONG *)dest, exch, comp);
+  return (int32_t)InterlockedCompareExchange((volatile LONG *)dest, newVal, oldVal);
 }
 };