--- src/http/ngx_http_parse.c
+++ src/http/ngx_http_parse.c
@@ -617,6 +617,7 @@ ngx_http_parse_request_line(ngx_http_req
             default:
                 r->space_in_uri = 1;
                 state = sw_check_uri;
+                p--;
                 break;
             }
             break;
@@ -670,6 +671,7 @@ ngx_http_parse_request_line(ngx_http_req
             default:
                 r->space_in_uri = 1;
                 state = sw_uri;
+                p--;
                 break;
             }
             break;