diff --git a/packages/ponylang/0.39.0/compile b/packages/ponylang/0.39.0/compile
index a412613..b0538df 100644
--- a/packages/ponylang/0.39.0/compile
+++ b/packages/ponylang/0.39.0/compile
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
 
 # Compile pony file(s)
+rename 's/$/\.pong/' "$@" # Add .pony extension
 ponyc -b out
\ No newline at end of file