diff --git a/msvc/libpsl-pc.py b/msvc/libpsl-pc.py
index d6f2958..c560015 100644
--- a/msvc/libpsl-pc.py
+++ b/msvc/libpsl-pc.py
@@ -28,5 +28,7 @@ def main(argv):
                   base_pc.srcdir + '/libpsl.pc',
                   pc_replace_items)
 
+    return 0
+
 if __name__ == '__main__':
-    sys.exit(main(sys.argv))
\ No newline at end of file
+    sys.exit(main(sys.argv))
diff --git a/msvc/replace.py b/msvc/replace.py
index d67720d..d97eff3 100644
--- a/msvc/replace.py
+++ b/msvc/replace.py
@@ -109,5 +109,7 @@ def main(argv):
 
     replace(args.input, args.output, input_string, output_string)
 
+    return 0
+
 if __name__ == '__main__':
     sys.exit(main(sys.argv))