diff --git a/usr/fileio/fileio.c b/usr/fileio/fileio.c
index 75d0215d8..2a4e75bb5 100644
--- a/usr/fileio/fileio.c
+++ b/usr/fileio/fileio.c
@@ -192,7 +192,7 @@ out:
 
 static void *align_alloc(size_t size)
 {
-	TRACE_MEM("Request to alloc %dKB", size / 1024);
+	TRACE_MEM("Request to alloc %zdKB", size / 1024);
 	return memalign(PAGE_SIZE, size);
 }