Index: libcfa/src/heap.cfa
===================================================================
--- libcfa/src/heap.cfa	(revision b80862527a8fa332e1ac8002ffb656700052b48a)
+++ libcfa/src/heap.cfa	(revision b38b22f035325393f7aa86402ade7a3554e3fee1)
@@ -10,6 +10,6 @@
 // Created On       : Tue Dec 19 21:58:35 2017
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Wed May  5 13:11:28 2021
-// Update Count     : 1035
+// Last Modified On : Sat May 22 08:46:39 2021
+// Update Count     : 1036
 //
 
@@ -640,6 +640,8 @@
 
 		#ifdef __STATISTICS__
-		free_storage += size;
-		#endif // __STATISTICS__
+		__atomic_add_fetch( &free_calls, 1, __ATOMIC_SEQ_CST );
+		__atomic_add_fetch( &free_storage, size, __ATOMIC_SEQ_CST );
+		#endif // __STATISTICS__
+
 		#if BUCKETLOCK == SPINLOCK
 		lock( freeElem->lock __cfaabi_dbg_ctx2 );		// acquire spin lock