diff --git a/setup/extensions.py b/setup/extensions.py
index 9e6e2d2ba6..7b2d7dfed0 100644
--- a/setup/extensions.py
+++ b/setup/extensions.py
@@ -174,7 +174,7 @@ extensions = [
 
     Extension('bzzdec',
         ['calibre/ebooks/djvu/bzzdecoder.c'],
-        inc_dirs=['calibre/utils/chm']  # For stdint.h
+        inc_dirs=(['calibre/utils/chm'] if iswindows else [])  # For stdint.h
     ),
 
     Extension('podofo',