diff --git a/src/formats/hevc_recv_normal.cc b/src/formats/hevc_recv_normal.cc
index a571368..4750869 100644
--- a/src/formats/hevc_recv_normal.cc
+++ b/src/formats/hevc_recv_normal.cc
@@ -246,6 +246,12 @@ rtp_error_t __hevc_receiver(kvz_rtp::receiver *receiver)
             /* initialize new frame */
             if (finfo.find(c_ts) == finfo.end()) {
 
+                /* make sure we haven't discarded the frame "c_ts" before */
+                if (dropped.find(c_ts) != dropped.end()) {
+                    LOG_WARN("packet belonging to a dropped frame was received!");
+                    continue;
+                }
+
                 /* when initializing a new frame, we need to keep twothings in mind:
                  * 1) new intra frame will supersede older intra frame 
                  * 2) new inter fame is accepted only if current intra has been returned 
@@ -259,8 +265,10 @@ rtp_error_t __hevc_receiver(kvz_rtp::receiver *receiver)
 
                 /* drop old intra if a new one is received */
                 if (nal_type == NT_INTRA) {
-                    if (intra != INVALID_TS)
+                    if (intra != INVALID_TS) {
                         __drop_frame(finfo, intra);
+                        dropped.insert(intra);
+                    }
                     intra = c_ts;
                 }
 
@@ -336,8 +344,10 @@ rtp_error_t __hevc_receiver(kvz_rtp::receiver *receiver)
             }
 
             if (__frame_late(finfo.at(c_ts))) {
-                if (nal_type != NT_INTRA || (nal_type == NT_INTRA && !enable_idelay))
+                if (nal_type != NT_INTRA || (nal_type == NT_INTRA && !enable_idelay)) {
                     __drop_frame(finfo, c_ts);
+                    dropped.insert(c_ts);
+                }
             }
         } while (ret == RTP_OK);
     }