diff --git a/src/ergogen_footprint_converter/main.py b/src/ergogen_footprint_converter/main.py
index 987106e..a375242 100644
--- a/src/ergogen_footprint_converter/main.py
+++ b/src/ergogen_footprint_converter/main.py
@@ -24,7 +24,7 @@ def convert(in_file: Path) -> str:
 
 
 def write_output (output: str, in_file: Path, out_dir: Path) -> None:
-    filename = in_file.name
+    filename = in_file.name.split('.')[0] + ".js"
 
     with open(filename, 'w') as file:
         file.writelines(output)