diff --git a/git_sim/settings.py b/git_sim/settings.py
index 4aad919..b7f7049 100644
--- a/git_sim/settings.py
+++ b/git_sim/settings.py
@@ -39,7 +39,7 @@ class Settings(BaseSettings):
     video_format: VideoFormat = VideoFormat.mp4
 
     class Config:
-        env_prefix = "git_sim"
+        env_prefix = "git_sim_"
 
 
 settings = Settings()