diff --git a/rcl/src/rcl/stdatomic_helper.h b/rcl/src/rcl/stdatomic_helper.h
index fc344b3..88c4140 100644
--- a/rcl/src/rcl/stdatomic_helper.h
+++ b/rcl/src/rcl/stdatomic_helper.h
@@ -118,7 +118,7 @@ rcl_atomic_exchange_uint64_t(atomic_uint_least64_t * a_uint64_t, uint64_t desire
   return result;
 }
 
-static inline uint64_t
+static inline uintptr_t
 rcl_atomic_exchange_uintptr_t(atomic_uintptr_t * a_uintptr_t, uintptr_t desired)
 {
   uintptr_t result;