diff --git a/src/apptask.js b/src/apptask.js
index cf96b020a..740b3fb1d 100644
--- a/src/apptask.js
+++ b/src/apptask.js
@@ -313,7 +313,7 @@ async function install(app, args, progressCallback) {
         await deleteAppDir(app, { removeDirectory: false }); // do not remove any symlinked appdata dir
     }
 
-    if (oldManifest && oldManifest.dockerImage === app.manifest.dockerImage) {
+    if (oldManifest && oldManifest.dockerImage !== app.manifest.dockerImage) {
         await docker.deleteImage(oldManifest);
     }