diff --git a/pkg/executor/build.go b/pkg/executor/build.go
index 7df7f7951..26794288d 100644
--- a/pkg/executor/build.go
+++ b/pkg/executor/build.go
@@ -421,7 +421,8 @@ func (s *stageBuilder) build() error {
 				// Raise Warnings for commands that are uncacheable
 				switch command.(type) {
 				case *commands.RunCommand:
-					if len(files) == 0 {
+					fi, err := os.Stat(tarPath)
+					if err == nil && fi.Size() <= emptyTarSize {
 						logrus.Warn("cache-violation: RUN created an empty layer, this will cause a diff when rebuilding from cache for the first time.")
 					}
 				case *commands.WorkdirCommand: