diff --git a/include/jemalloc/internal/prof_inlines_a.h b/include/jemalloc/internal/prof_inlines_a.h
index d77635a8..d0d29685 100644
--- a/include/jemalloc/internal/prof_inlines_a.h
+++ b/include/jemalloc/internal/prof_inlines_a.h
@@ -22,15 +22,16 @@ prof_accum_add(tsdn_t *tsdn, prof_accum_t *prof_accum, uint64_t accumbytes) {
 	 * avoids rate-limiting allocation.
 	 */
 #ifdef JEMALLOC_ATOMIC_U64
+	a0 = atomic_load_u64(&prof_accum->accumbytes, ATOMIC_RELAXED);
 	do {
-		a0 = atomic_read_u64(&prof_accum->accumbytes);
 		a1 = a0 + accumbytes;
 		assert(a1 >= a0);
 		overflow = (a1 >= prof_interval);
 		if (overflow) {
 			a1 %= prof_interval;
 		}
-	} while (atomic_cas_u64(&prof_accum->accumbytes, a0, a1));
+	} while (!atomic_compare_exchange_weak_u64(&prof_accum->accumbytes, &a0,
+	    a1, ATOMIC_RELAXED, ATOMIC_RELAXED));
 #else
 	malloc_mutex_lock(tsdn, &prof_accum->mtx);
 	a0 = prof_accum->accumbytes;
@@ -57,11 +58,12 @@ prof_accum_cancel(tsdn_t *tsdn, prof_accum_t *prof_accum, size_t usize) {
 	 */
 	uint64_t a0, a1;
 #ifdef JEMALLOC_ATOMIC_U64
+	a0 = atomic_load_u64(&prof_accum->accumbytes, ATOMIC_RELAXED);
 	do {
-		a0 = atomic_read_u64(&prof_accum->accumbytes);
 		a1 = (a0 >= LARGE_MINCLASS - usize) ?  a0 - (LARGE_MINCLASS -
 		    usize) : 0;
-	} while (atomic_cas_u64(&prof_accum->accumbytes, a0, a1));
+	} while (!atomic_compare_exchange_weak_u64(&prof_accum->accumbytes, &a0,
+	    a1, ATOMIC_RELAXED, ATOMIC_RELAXED));
 #else
 	malloc_mutex_lock(tsdn, &prof_accum->mtx);
 	a0 = prof_accum->accumbytes;
diff --git a/include/jemalloc/internal/prof_structs.h b/include/jemalloc/internal/prof_structs.h
index afff6aa5..fba8c295 100644
--- a/include/jemalloc/internal/prof_structs.h
+++ b/include/jemalloc/internal/prof_structs.h
@@ -18,8 +18,10 @@ typedef struct {
 struct prof_accum_s {
 #ifndef JEMALLOC_ATOMIC_U64
 	malloc_mutex_t	mtx;
-#endif
 	uint64_t	accumbytes;
+#else
+	atomic_u64_t	accumbytes;
+#endif
 };
 
 struct prof_cnt_s {
diff --git a/src/prof.c b/src/prof.c
index 4e83ae3f..ce02d99c 100644
--- a/src/prof.c
+++ b/src/prof.c
@@ -1758,8 +1758,10 @@ prof_accum_init(tsdn_t *tsdn, prof_accum_t *prof_accum) {
 	    WITNESS_RANK_PROF_ACCUM)) {
 		return true;
 	}
-#endif
 	prof_accum->accumbytes = 0;
+#else
+	atomic_store_u64(&prof_accum->accumbytes, 0, ATOMIC_RELAXED);
+#endif
 	return false;
 }