diff --git a/libguile/backtrace.c b/libguile/backtrace.c
index 620252eb0..eecbb5af8 100644
--- a/libguile/backtrace.c
+++ b/libguile/backtrace.c
@@ -46,11 +46,12 @@
 #include <stdio.h>
 #include <ctype.h>
 
+#include "_scm.h"
+
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
-#include "_scm.h"
 #include "stacks.h"
 #include "srcprop.h"
 #include "genio.h"