diff --git a/src/runtime/python/setup.py b/src/runtime/python/setup.py
index 31f5cd86c..1c3069bd8 100644
--- a/src/runtime/python/setup.py
+++ b/src/runtime/python/setup.py
@@ -14,6 +14,7 @@ if libraries==['']:
 if on_windows:
     cpath = '../c/pgf/'
     extra_sources = [cpath+f for f in os.listdir(cpath) if f.endswith('.cxx')]
+    includes+=["../c"]
 else:
     extra_sources = []