diff --git a/setup.py b/setup.py
index d89f1fe..ad8dc63 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@
     license = 'MIT',
     description = 'Inverse-Path-Distance-Weighted Interpolation for Python',
     long_description=LONG_DESCRIPTION,
-    long_description_content_type = text/markdown,
+    long_description_content_type = 'text/markdown',
     author = 'Kyle Wright',
     author_email = 'Kyle.Wright@twdb.texas.gov',
     url = 'https://github.com/wrightky/ipdw',