diff --git a/commands/ubi.c b/commands/ubi.c
index 1653eaa..7348394 100644
--- a/commands/ubi.c
+++ b/commands/ubi.c
@@ -47,7 +47,7 @@
 static const __maybe_unused char cmd_ubimkvol_help[] =
 "Usage: ubimkvol <ubidev> <name> <size>\n"
 "Create an ubi volume on <ubidev> with name <name> and size <size>\n"
-"If size os zero all available space is used for the volume\n";
+"If size is zero all available space is used for the volume\n";
 
 BAREBOX_CMD_START(ubimkvol)
 	.cmd		= do_ubimkvol,