diff --git a/scripts/minikconf.py b/scripts/minikconf.py
index 40ae1989e1..febd9a479f 100644
--- a/scripts/minikconf.py
+++ b/scripts/minikconf.py
@@ -645,7 +645,7 @@ class KconfigParser:
             self.cursor = self.src.find('\n', self.cursor)
             self.val = self.src[start:self.cursor]
             return TOK_SOURCE
-        elif self.tok.isalpha():
+        elif self.tok.isalnum():
             # identifier
             while self.src[self.cursor].isalnum() or self.src[self.cursor] == '_':
                 self.cursor += 1