diff --git a/src/window.c b/src/window.c
index a51ca94..41e7706 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4058,7 +4058,8 @@
 }
 #endif
 
-#if (defined(FEAT_WINDOWS) && defined(FEAT_PYTHON)) || defined(PROTO)
+#if (defined(FEAT_WINDOWS) && (defined(FEAT_PYTHON) || defined(FEAT_PYTHON3))) \
+	|| defined(PROTO)
 /*
  * Find the tabpage for window "win".
  */