diff --git a/lib/stormpy/__init__.py b/lib/stormpy/__init__.py
index f1ee516..91da0a8 100644
--- a/lib/stormpy/__init__.py
+++ b/lib/stormpy/__init__.py
@@ -1,3 +1,8 @@
+import sys
+
+if sys.version_info[0] == 2:
+    raise ImportError('Python 2.x is not supported for stormpy.')
+
 from . import core
 from .core import *
 from . import storage