diff --git a/trace.go b/trace.go
index fb4103f..464e8cf 100644
--- a/trace.go
+++ b/trace.go
@@ -425,7 +425,7 @@ func (t *trace) ReleaseMemory(scope string, size, mem int64) {
 	t.push(TraceEvt{
 		Type:   TraceReleaseMemoryEvt,
 		Name:   scope,
-		Delta:  size,
+		Delta:  -size,
 		Memory: mem,
 	})
 }