diff --git a/include/chibi/sexp.h b/include/chibi/sexp.h
index fb8e33b1..53e771e4 100644
--- a/include/chibi/sexp.h
+++ b/include/chibi/sexp.h
@@ -14,9 +14,6 @@ extern "C" {
 #include "chibi/features.h"
 #include "chibi/install.h"
 
-#include <ctype.h>
-#include <stdio.h>
-
 #if SEXP_USE_DL
 #ifndef __MINGW32__
 #include <dlfcn.h>
@@ -40,6 +37,9 @@ typedef unsigned long size_t;
 #include <math.h>
 #endif
 
+#include <ctype.h>
+#include <stdio.h>
+
 /* tagging system
  *   bits end in  00:  pointer
  *                01:  fixnum