diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index 8529f5c5..43afe9d1 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -570,7 +570,7 @@ hexdump(int partnum)
 	uint16_t val16;
 
 	for (row = 0; row < 8; row++) {
-		printf("%08lx ", row << 4);
+		printf("%08zx ", row << 4);
 		for (c = 0; c < 8; c++) {
 			val16 = word((row << 3) + c, partnum);
 			if (c == 4)