diff --git a/fdroidserver/metadata.py b/fdroidserver/metadata.py
index 5d4c0b5b..0112a0ec 100644
--- a/fdroidserver/metadata.py
+++ b/fdroidserver/metadata.py
@@ -842,17 +842,14 @@ esc_newlines = re.compile(r'\\( |\n)')
 # This function uses __dict__ to be faster
 def post_metadata_parse(app):
 
-    for k, v in app.__dict__.items():
-        if k not in app._modified:
-            continue
+    for k in app._modified:
+        v = app.__dict__[k]
         if type(v) in (float, int):
             app.__dict__[k] = str(v)
 
     for build in app.builds:
-        for k, v in build.__dict__.items():
-
-            if k not in build._modified:
-                continue
+        for k in build._modified:
+            v = build.__dict__[k]
             if type(v) in (float, int):
                 build.__dict__[k] = str(v)
                 continue