diff --git a/toolbox/getevent.c b/toolbox/getevent.c
index e2c77c3..f65bb20 100644
--- a/toolbox/getevent.c
+++ b/toolbox/getevent.c
@@ -111,8 +111,7 @@
                 break;
             bits_size = res + 16;
             bits = realloc(bits, bits_size * 2);
-            if(bits == NULL)
-                err(1, "failed to allocate buffer of size %d\n", (int)bits_size);
+            if (bits == NULL) err(1, "failed to allocate buffer of size %zd", bits_size);
         }
         res2 = 0;
         switch(i) {