diff --git a/kernel/kernel.c b/kernel/kernel.c
index 0073060..0eee987 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -232,6 +232,12 @@ int printf(const char *format, ...)
     return 0;
 }
 
+int fprintf(FILE *stream, const char *format, ...)
+{
+    /* FIXME */
+    return 0;
+}
+
 int sprintf(char *str, const char *format, ...)
 {
     /* FIXME */
diff --git a/kernel/kernel.h b/kernel/kernel.h
index 2d671f8..c282395 100644
--- a/kernel/kernel.h
+++ b/kernel/kernel.h
@@ -76,9 +76,7 @@ int rand(void);
 int abs(int j);
 void exit(int status);
 void srand(unsigned int s);
-int stdint;
-int stdout;
-int stderr;
+FILE *stdin, *stdout, *stderr;
 
 /* string.h functions */
 void *memset(void *s, int c, size_t n);
@@ -100,6 +98,7 @@ char *fgets(char *s, int size, FILE *stream);
 size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
 int fclose(FILE *fp);
 int printf(const char *format, ...);
+int fprintf(FILE *stream, const char *format, ...);
 int sprintf(char *str, const char *format, ...);
 int sscanf(const char *str, const char *format, ...);