diff --git a/trace.go b/trace.go
index fe45404..b178f29 100644
--- a/trace.go
+++ b/trace.go
@@ -261,7 +261,7 @@ func (t *trace) ReleaseMemory(scope string, size, mem int64) {
 	t.push(traceEvt{
 		Type:   traceReleaseMemoryEvt,
 		Scope:  scope,
-		Delta:  -size,
+		Delta:  size,
 		Memory: mem,
 	})
 }