diff --git a/commands/nand.c b/commands/nand.c
index 0902f21..d3921b9 100644
--- a/commands/nand.c
+++ b/commands/nand.c
@@ -63,7 +63,7 @@
 			return ret;
 
 		if (ret) {
-			printf("skipping bad block at 0x%08x\n", bb->offset);
+			printf("skipping bad block at 0x%08lx\n", bb->offset);
 			bb->offset += bb->info.erasesize;
 			continue;
 		}