diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
index a45c04554..4dea76cb1 100644
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -972,6 +972,7 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
         case sw_space_before_value:
             switch (ch) {
             case ' ':
+            case '\t':
                 break;
             case CR:
                 r->header_start = p;
@@ -996,6 +997,7 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
         case sw_value:
             switch (ch) {
             case ' ':
+            case '\t':
                 r->header_end = p;
                 state = sw_space_after_value;
                 break;
@@ -1016,6 +1018,7 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
         case sw_space_after_value:
             switch (ch) {
             case ' ':
+            case '\t':
                 break;
             case CR:
                 state = sw_almost_done;