diff --git a/src/gnuwin32/rt_complete.c b/src/gnuwin32/rt_complete.c
index 6613ffa263..2a7ecb62ae 100644
--- a/src/gnuwin32/rt_complete.c
+++ b/src/gnuwin32/rt_complete.c
@@ -32,9 +32,9 @@
 # define min(a, b) (a < b ? a : b)
 #endif
 
+#include <Defn.h>
 #include <Rinternals.h>
 #include <R_ext/Parse.h>
-#include <Defn.h>
 
 static int completion_available = -1;