diff --git a/setup.py b/setup.py
index 14119a5..e960f4e 100755
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 try:
     float(version)
 except ValueError:
-    version = 1.5
+    version = '1.5'
 
 with open("README.md", "r") as fh:
     long_description = fh.read()