diff --git a/commands/memset.c b/commands/memset.c
index f871e07..f99bf86 100644
--- a/commands/memset.c
+++ b/commands/memset.c
@@ -56,7 +56,7 @@
 	c = strtoull_suffix(argv[optind + 1], NULL, 0);
 	n = strtoull_suffix(argv[optind + 2], NULL, 0);
 
-	fd = open_and_lseek(file, mode | O_WRONLY, s);
+	fd = open_and_lseek(file, mode | O_WRONLY | O_CREAT, s);
 	if (fd < 0)
 		return 1;
 
diff --git a/commands/mm.c b/commands/mm.c
index 6d2a887..c7f62fc 100644
--- a/commands/mm.c
+++ b/commands/mm.c
@@ -53,7 +53,7 @@
 	value = simple_strtoull(argv[optind++], NULL, 0);
 	mask = simple_strtoull(argv[optind++], NULL, 0);
 
-	fd = open_and_lseek(filename, mode | O_RDWR, adr);
+	fd = open_and_lseek(filename, mode | O_RDWR | O_CREAT, adr);
 	if (fd < 0)
 		return 1;
 
diff --git a/commands/mw.c b/commands/mw.c
index 7ff589a..2912997 100644
--- a/commands/mw.c
+++ b/commands/mw.c
@@ -52,7 +52,7 @@
 
 	adr = strtoull_suffix(argv[optind++], NULL, 0);
 
-	fd = open_and_lseek(filename, mode | O_WRONLY, adr);
+	fd = open_and_lseek(filename, mode | O_WRONLY | O_CREAT, adr);
 	if (fd < 0)
 		return 1;