diff --git a/firmware/include/stdio.h b/firmware/include/stdio.h
index e8d35bc502..b98f01c729 100644
--- a/firmware/include/stdio.h
+++ b/firmware/include/stdio.h
@@ -1,6 +1,8 @@
 #ifndef _STDIO_H_
 #define	_STDIO_H_
 
+#include <_ansi.h>
+
 #define __need_size_t
 #include <stddef.h>
 
@@ -31,11 +33,7 @@
 #define __VALIST char*
 #endif
 
-int	_EXFUN(fprintf, (FILE *, const char *, ...));
-int	_EXFUN(fscanf, (FILE *, const char *, ...));
-int	_EXFUN(printf, (const char *, ...));
-int	_EXFUN(vfprintf, (FILE *, const char *, __VALIST));
-int	_EXFUN(vprintf, (const char *, __VALIST));
-int	_EXFUN(vsprintf, (char *, const char *, __VALIST));
+int snprintf (char *buf, size_t size, const char *fmt, ...);
+int vsnprintf (char *buf, int size, const char *fmt, __VALIST ap);
 
 #endif /* _STDIO_H_ */
diff --git a/firmware/include/stdlib.h b/firmware/include/stdlib.h
index ab07a3116e..2809172a7d 100644
--- a/firmware/include/stdlib.h
+++ b/firmware/include/stdlib.h
@@ -29,6 +29,13 @@ extern __IMPORT int __mb_cur_max;
 
 _VOID	_EXFUN(qsort,(_PTR __base, size_t __nmemb, size_t __size, int(*_compar)(const _PTR, const _PTR)));
 
+void *malloc(size_t);
+void *calloc (size_t nmemb, size_t size);
+void free(void *);
+void *realloc(void *, size_t);
+
+#define abs(x) ((x)>0?x:-x)
+
 #ifdef __cplusplus
 }
 #endif