diff --git a/libs/lexer/src/lexer.c b/libs/lexer/src/lexer.c
index 96f4ab7..a6c4c8f 100644
--- a/libs/lexer/src/lexer.c
+++ b/libs/lexer/src/lexer.c
@@ -331,6 +331,7 @@ void scc_lexer_get_token(scc_lexer_t *lexer, scc_lexer_tok_t *token) {
         break;
     case '\r':
     case '\n':
+        scc_probe_stream_back(stream);
         scc_lex_parse_skip_endline(stream, &lexer->pos);
         scc_probe_stream_sync(stream);
         token->type = SCC_TOK_BLANK;
diff --git a/runtime/scc_core/include/scc_core_stream.h b/runtime/scc_core/include/scc_core_stream.h
index ccf145d..31db64f 100644
--- a/runtime/scc_core/include/scc_core_stream.h
+++ b/runtime/scc_core/include/scc_core_stream.h
@@ -30,15 +30,15 @@ struct scc_probe_stream {
     /// @brief 移动探针位置并返回字符
     int (*next)(scc_probe_stream_t *stream);
 
+    /// @brief 回退一个字符（单次后退，探针位置后退一步）
+    cbool (*back)(scc_probe_stream_t *stream);
+
     /// @brief 移动头指针到探针位置
     void (*sync)(scc_probe_stream_t *stream);
 
     /// @brief 重置探针位置到头指针位置
     void (*reset)(scc_probe_stream_t *stream);
 
-    /// @brief 回退一个字符（单次后退，头指针后退一步）
-    cbool (*back)(scc_probe_stream_t *stream);
-
     /// @brief 读取指定数量的字符到缓冲区
     usize (*read_buf)(scc_probe_stream_t *stream, char *buffer, usize count);
 
diff --git a/runtime/scc_core/src/stream.c b/runtime/scc_core/src/stream.c
index 571895a..a2cd64d 100644
--- a/runtime/scc_core/src/stream.c
+++ b/runtime/scc_core/src/stream.c
@@ -59,12 +59,13 @@ static cbool mem_probe_stream_back(scc_probe_stream_t *_stream) {
     Assert(_stream != null);
     scc_mem_probe_stream_t *stream = (scc_mem_probe_stream_t *)_stream;
 
-    // 只能回退一个字符，且不能回退到探针位置之前
-    if (stream->curr_pos == 0 || stream->curr_pos <= stream->probe_pos) {
+    // 只能回退一个字符
+    if (stream->probe_pos == 0)
+        return false;
+    if (stream->curr_pos + 1 > stream->probe_pos)
         return false;
-    }
 
-    stream->curr_pos--;
+    stream->probe_pos--;
     return true;
 }