diff --git a/src/main.py b/src/main.py
index 22c69d3..5d2541f 100644
--- a/src/main.py
+++ b/src/main.py
@@ -91,7 +91,7 @@ async def co2():
     if co2 is None:
         return {"message": "Failed to read co2"}
 
-    await queue.add_action_to_queue(matrix_display.show_text, f"{co2}ppm")
+    await queue.add_action_to_queue(matrix_display.show_text, f"{co2} ppm")
 
     return {"co2": co2}