diff --git a/shaketune/graph_creators/__init__.py b/shaketune/graph_creators/__init__.py
index dd175b2..f921996 100644
--- a/shaketune/graph_creators/__init__.py
+++ b/shaketune/graph_creators/__init__.py
@@ -11,7 +11,7 @@
 
 
 def get_shaper_calibrate_module():
-    if not os.environ.get('SHAKETUNE_IN_CLI') == '1':
+    if os.environ.get('SHAKETUNE_IN_CLI') != '1':
         from ... import shaper_calibrate
     else:
         shaper_calibrate = sys.modules['shaper_calibrate']