diff --git a/n.c b/n.c
index 3b044fc..c63362e 100644
--- a/n.c
+++ b/n.c
@@ -1,5 +1,6 @@
 /* n.c -- generated via skint nsf2c.ssc n.sf */
 
+#include "s.h"
 #include "n.h"
 
 #ifdef NAN_BOXING
@@ -999,8 +1000,6 @@ void oportputshared(obj x, obj p, int disp) {
 
 /* system-dependent extensions */
 
-#include "s.h"
-
 
 extern int is_tty_port(obj o)
 {
diff --git a/pre/n.sf b/pre/n.sf
index 6dbaa7a..a037687 100644
--- a/pre/n.sf
+++ b/pre/n.sf
@@ -4,6 +4,7 @@
 ;
 ;------------------------------------------------------------------------------
 
+(%include "s.h")
 
 ;------------------------------------------------------------------------------
 
@@ -1526,7 +1527,6 @@ void oportputshared(obj x, obj p, int disp) {
 ; system-dependent extensions
 
 (%localdef "/* system-dependent extensions */")
-(%localdef "#include \"s.h\"")
 
 (%localdef "
 extern int is_tty_port(obj o)
diff --git a/pre/nsf2c.ssc b/pre/nsf2c.ssc
index 05b0df3..199c9ef 100644
--- a/pre/nsf2c.ssc
+++ b/pre/nsf2c.ssc
@@ -41,13 +41,19 @@
   (display ".c -- generated via skint nsf2c.ssc " oport) 
   (display (path-strip-directory ifname) oport) 
   (display " */" oport) (newline oport) (newline oport)
-  (display "#include \"" oport)
-  (display mname oport) 
-  (display ".h\"" oport) (newline oport) (newline oport)
-  (let loop ([x (read iport)])
+  (let loop ([x (read iport)] [end-of-includes? #f])
     (unless (eof-object? x)
-      (process-top-form x oport)
-      (loop (read iport))))
+      (cond [end-of-includes?
+             (process-top-form x oport) 
+             (loop (read iport) #t)]
+            [(and (list2? x) (eq? (car x) '%include) (string? (cadr x)))
+             (display "#include " oport) (write (cadr x) oport) (newline oport)
+             (loop (read iport) #f)]
+            [else ; switching to body forms
+             (display "#include \"" oport) (display mname oport) 
+             (display ".h\"" oport) (newline oport) (newline oport)
+             (process-top-form x oport) 
+             (loop (read iport) #t)])))
   (close-input-port iport)
   (if (pair? ?ofname) (close-output-port oport)))
 
diff --git a/pre/nsf2h.ssc b/pre/nsf2h.ssc
index d0fb7f9..c4d62dc 100644
--- a/pre/nsf2h.ssc
+++ b/pre/nsf2h.ssc
@@ -117,7 +117,7 @@ extern char **cxg_argv;
     (case (car x)
       [(%definition) (display (cadr x) oport) (newline oport)]
       [(%localdef)] ; does not go into n.h
-      [(%include)]))) ; time.h already in prelude
+      [(%include)]))) ; all needed includes already included
 
 (define (process-file ifname . ?ofname)
   (define iport (open-input-file ifname)) ; relative to wd, not this script!