diff --git a/scripts/config.py b/scripts/config.py
index d6eb2e4..20521a5 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -452,7 +452,7 @@
                 value = config[args.symbol]
                 if value:
                     sys.stdout.write(value + '\n')
-            return args.symbol not in config
+            return 0 if args.symbol in config else 1
         elif args.command == 'set':
             if not args.force and args.symbol not in config.settings:
                 sys.stderr.write("A #define for the symbol {} "
@@ -465,6 +465,7 @@
         else:
             config.adapt(args.adapter)
         config.write(args.write)
+        return 0
 
     # Import modules only used by main only if main is defined and called.
     # pylint: disable=wrong-import-position