diff --git a/src/if_python3.c b/src/if_python3.c
index 53a1313..d68ab85 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -1004,6 +1004,9 @@
 {
     char_u *script;
 
+    if (p_pyx == 0)
+	p_pyx = 3;
+
     script = script_get(eap, eap->arg);
     if (!eap->skip)
     {
@@ -1028,6 +1031,9 @@
     char *p;
     int i;
 
+    if (p_pyx == 0)
+	p_pyx = 3;
+
     /* Have to do it like this. PyRun_SimpleFile requires you to pass a
      * stdio file pointer, but Vim and the Python DLL are compiled with
      * different options under Windows, meaning that stdio pointers aren't
@@ -1080,6 +1086,9 @@
     void
 ex_py3do(exarg_T *eap)
 {
+    if (p_pyx == 0)
+	p_pyx = 3;
+
     DoPyCommand((char *)eap->arg,
 	    (rangeinitializer)init_range_cmd,
 	    (runner)run_do,