diff --git a/src/scconf/lex-parse.l b/src/scconf/lex-parse.l
index f531db97..198ca9ce 100644
--- a/src/scconf/lex-parse.l
+++ b/src/scconf/lex-parse.l
@@ -59,9 +59,14 @@ int scconf_lex_parse(scconf_parser *p, const char *filename)
 		return 0;
 
 	yylex();
-#if 0
-	yy_delete_buffer(yy_current_buffer);
-	yy_current_buffer = NULL;
+#if 1
+	/* For non-reentrant C scanner only. */
+	if (yy_current_buffer) {
+		yy_delete_buffer(yy_current_buffer);
+		yy_current_buffer = NULL;
+		yy_init = 1;
+		yy_start = 0;
+	}
 #endif
 	fclose(yyin);
 	return 1;