diff --git a/include/mimalloc/atomic.h b/include/mimalloc/atomic.h
index 6eaa6f99..2984f50f 100644
--- a/include/mimalloc/atomic.h
+++ b/include/mimalloc/atomic.h
@@ -266,6 +266,13 @@ static inline int64_t mi_atomic_addi64_relaxed(volatile _Atomic(int64_t)*p, int6
   return current;
 #endif
 }
+static inline void mi_atomic_void_addi64_relaxed(volatile int64_t* p, const volatile int64_t* padd) {
+  const int64_t add = *padd;
+  if (add != 0) {
+    mi_atomic_addi64_relaxed((volatile _Atomic(int64_t)*)p, add);
+  }
+}
+
 static inline void mi_atomic_maxi64_relaxed(volatile _Atomic(int64_t)*p, int64_t x) {
   int64_t current;
   do {