diff --git a/cli_classic.c b/cli_classic.c
index dc3a651a6..b3930d214 100644
--- a/cli_classic.c
+++ b/cli_classic.c
@@ -715,7 +715,7 @@ int main(int argc, char *argv[])
 	}
 
 	if (flash_size) {
-		printf("%ld\n", flashrom_flash_getsize(fill_flash));
+		printf("%zu\n", flashrom_flash_getsize(fill_flash));
 		goto out_shutdown;
 	}