diff --git a/rttk/run.py b/rttk/run.py
index 5dc2980..b75f73a 100644
--- a/rttk/run.py
+++ b/rttk/run.py
@@ -33,7 +33,7 @@ except:
 
 def renpy(args):
     global in_renpy
-    command = [os.path.join(os.environ['$RENPY_DIR'], 'renpy.sh')]
+    command = [os.path.join(os.environ['RENPY_DIR'], 'renpy.sh')]
     if in_renpy:
         # cf. launcher/game/project.rpy
         command = [sys.executable, '-EO', sys.argv[0]]