diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index e8b01b721e99d3954e344686fc615c9455e4246c..e53292d0c21bcd9d57c3f219d3f7cc31d5eb836e 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -267,7 +267,7 @@ static int check_namespace(const struct qstr *nm)
 
 	if (!strncmp(nm->name, XATTR_TRUSTED_PREFIX,
 		     XATTR_TRUSTED_PREFIX_LEN)) {
-		if (nm->name[sizeof(XATTR_TRUSTED_PREFIX) - 1] == '\0')
+		if (nm->name[XATTR_TRUSTED_PREFIX_LEN] == '\0')
 			return -EINVAL;
 		type = TRUSTED_XATTR;
 	} else if (!strncmp(nm->name, XATTR_USER_PREFIX,
@@ -277,7 +277,7 @@ static int check_namespace(const struct qstr *nm)
 		type = USER_XATTR;
 	} else if (!strncmp(nm->name, XATTR_SECURITY_PREFIX,
 				     XATTR_SECURITY_PREFIX_LEN)) {
-		if (nm->name[sizeof(XATTR_SECURITY_PREFIX) - 1] == '\0')
+		if (nm->name[XATTR_SECURITY_PREFIX_LEN] == '\0')
 			return -EINVAL;
 		type = SECURITY_XATTR;
 	} else