1 files changed, 1 insertions, 1 deletions
diff --git a/printf.c b/printf.c
index 9972b45..b3298aa 100644
--- a/printf.c
+++ b/printf.c
@@ -37,7 +37,7 @@ printint(int fd, int xx, int base, int sgn)
 
 // Print to the given fd. Only understands %d, %x, %p, %s.
 void
-printf(int fd, char *fmt, ...)
+printf(int fd, const char *fmt, ...)
 {
   char *s;
   int c, i, state;