only include stdio when used

1 files changed, 2 insertions, 1 deletions

diff --git a/siphash.c b/siphash.c
index 003eb5b..854c6ce 100644
--- a/siphash.c
+++ b/siphash.c
@@ -17,8 +17,8 @@
 
 #include "siphash.h"
 #include <assert.h>
+#include <stddef.h>
 #include <stdint.h>
-#include <stdio.h>
 
 /* default: SipHash-2-4 */
 #ifndef cROUNDS
@@ -65,6 +65,7 @@
     } while (0)
 
 #ifdef DEBUG
+#include <stdio.h>
 #define TRACE                                                                  \
     do {                                                                       \
         printf("(%3zu) v0 %016" PRIx64 "\n", inlen, v0);                       \