diff --git a/platformio/fs.py b/platformio/fs.py
index 080f1502..c81a50db 100644
--- a/platformio/fs.py
+++ b/platformio/fs.py
@@ -62,7 +62,7 @@ def write_file_contents(path, contents):
     try:
         with open(path, "w") as fp:
             return fp.write(contents)
-    except UnicodeDecodeError:
+    except UnicodeEncodeError:
         with io.open(path, "w", encoding="latin-1") as fp:
             return fp.write(contents)