diff --git a/src/http/ngx_http_spdy.c b/src/http/ngx_http_spdy.c
index 9c80feb..bada9c8 100644
--- a/src/http/ngx_http_spdy.c
+++ b/src/http/ngx_http_spdy.c
@@ -1528,7 +1528,6 @@
         complete = 1;
 
     } else {
-        sc->length -= size;
         complete = 0;
     }
 
@@ -1571,6 +1570,8 @@
             }
         }
 
+        sc->length -= size;
+
         if (tf) {
             buf->start = pos;
             buf->pos = pos;