diff --git a/dom/media/gmp/GMPVideoDecoderChild.cpp b/dom/media/gmp/GMPVideoDecoderChild.cpp
index 259690628776..fcccbdf10a1b 100644
--- a/dom/media/gmp/GMPVideoDecoderChild.cpp
+++ b/dom/media/gmp/GMPVideoDecoderChild.cpp
@@ -225,7 +225,8 @@ GMPVideoDecoderChild::Alloc(size_t aSize,
   ++mNeedShmemIntrCount;
   rv = CallNeedShmem(aSize, aMem);
   --mNeedShmemIntrCount;
-  if (mPendingDecodeComplete) {
+  if (mPendingDecodeComplete && mNeedShmemIntrCount == 0) {
+    mPendingDecodeComplete = false;
     mPlugin->GMPMessageLoop()->PostTask(
       NewRunnableMethod(this, &GMPVideoDecoderChild::RecvDecodingComplete));
   }
diff --git a/dom/media/gmp/GMPVideoEncoderChild.cpp b/dom/media/gmp/GMPVideoEncoderChild.cpp
index fa139cef4900..1b9196a1e3c2 100644
--- a/dom/media/gmp/GMPVideoEncoderChild.cpp
+++ b/dom/media/gmp/GMPVideoEncoderChild.cpp
@@ -206,7 +206,8 @@ GMPVideoEncoderChild::Alloc(size_t aSize,
   ++mNeedShmemIntrCount;
   rv = CallNeedShmem(aSize, aMem);
   --mNeedShmemIntrCount;
-  if (mPendingEncodeComplete) {
+  if (mPendingEncodeComplete && mNeedShmemIntrCount == 0) {
+    mPendingEncodeComplete = false;
     mPlugin->GMPMessageLoop()->PostTask(
       NewRunnableMethod(this, &GMPVideoEncoderChild::RecvEncodingComplete));
   }