diff --git a/plugins/common/docker.go b/plugins/common/docker.go
index b813a0cac..25740a5d1 100644
--- a/plugins/common/docker.go
+++ b/plugins/common/docker.go
@@ -155,7 +155,7 @@ func CopyFromImage(appName string, image string, source string, destination stri
 	}()
 
 	// write contents to tmpFile
-	if _, err := tmpFile.Write([]byte(contents)); err != nil {
+	if _, err := tmpFile.Write([]byte(content)); err != nil {
 		return fmt.Errorf("Unable to write to temporary file: %v", err)
 	}