diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index a21aa74b49484b8670b3998dfa05d99416b944b7..79aef50ede1703ae3dbaf8e2af7d8a67369481d3 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1271,7 +1271,8 @@ static int secref_whitelist(const struct sectioncheck *mismatch,
 
 static inline int is_arm_mapping_symbol(const char *str)
 {
-	return str[0] == '$' && strchr("axtd", str[1])
+	return str[0] == '$' &&
+	       (str[1] == 'a' || str[1] == 'd' || str[1] == 't' || str[1] == 'x')
 	       && (str[2] == '\0' || str[2] == '.');
 }