diff --git a/doc/makepanda/makepanda.py b/doc/makepanda/makepanda.py
index 26cdb04642..26a7932a5a 100755
--- a/doc/makepanda/makepanda.py
+++ b/doc/makepanda/makepanda.py
@@ -696,7 +696,7 @@ for version,key1,key2,subdir in MAXVERSIONS:
 ########################################################################
 
 if (OMIT.count("PYTHON")==0):
-    if (sys.platform != "win32"):
+    if (sys.platform == "win32"):
         PYTHONSDK="thirdparty/win-python"
     else:
         if   (os.path.isdir("/usr/include/python2.5")): PYTHONSDK = "/usr/include/python2.5"