diff --git a/ORCACDefs/stdio.h b/ORCACDefs/stdio.h
index 679e9cb..fa301a7 100644
--- a/ORCACDefs/stdio.h
+++ b/ORCACDefs/stdio.h
@@ -100,17 +100,13 @@ extern FILE *stdout;
 typedef long fpos_t;
 
 /*
- *  Functions declared as macros
+ *  Function declared as a macro
  */
 
-void            setbuf(FILE *, char *);
 void            rewind(FILE *);
-
-#define setbuf(stream,buf)      ((buf==NULL) ? (void) __setvbuf(stream,NULL,_IONBF,0l) : (void) __setvbuf(stream,buf,_IOFBF,(size_t) BUFSIZ))
 #define rewind(stream)          (__fseek((stream),0L,SEEK_SET))
 
-/* Private functions used in the above macros (not to be used otherwise) */
-int             __setvbuf(FILE *, char *, int, size_t);
+/* Private function used in the above macro (not to be used otherwise) */
 int             __fseek(FILE *, long, int);
 
 /*
@@ -147,6 +143,7 @@ int             puts(const char *);
 int             remove(const char *);
 int             rename(const char *, const char *);
 int             scanf(const char *, ...);
+void            setbuf(FILE *, char *);
 int             setvbuf(FILE *, char *, int, size_t);
 int             sprintf(char *, const char *, ...);
 int             sscanf(const char *, const char *, ...);