diff --git a/dlls/mf/session.c b/dlls/mf/session.c
index 05b7af81df7..6ee3c454c6e 100644
--- a/dlls/mf/session.c
+++ b/dlls/mf/session.c
@@ -2295,6 +2295,8 @@ static enum object_state session_get_object_state_for_event(MediaEventType event
 {
     switch (event)
     {
+        case MESourceSeeked:
+        case MEStreamSeeked:
         case MESourceStarted:
         case MEStreamStarted:
         case MEStreamSinkStarted:
@@ -2471,6 +2473,7 @@ static void session_set_source_object_state(struct media_session *session, IUnkn
 
     switch (event_type)
     {
+        case MESourceSeeked:
         case MESourceStarted:
         case MESourcePaused:
         case MESourceStopped:
@@ -2485,6 +2488,7 @@ static void session_set_source_object_state(struct media_session *session, IUnkn
                 }
             }
             break;
+        case MEStreamSeeked:
         case MEStreamStarted:
         case MEStreamPaused:
         case MEStreamStopped:
@@ -3172,6 +3176,10 @@ static HRESULT WINAPI session_events_callback_Invoke(IMFAsyncCallback *iface, IM
 
     switch (event_type)
     {
+        case MESourceSeeked:
+        case MEStreamSeeked:
+            FIXME("Source/stream seeking, semi-stub!\n");
+            /* fallthrough */
         case MESourceStarted:
         case MESourcePaused:
         case MESourceStopped:
diff --git a/dlls/mfplat/tests/mfplat.c b/dlls/mfplat/tests/mfplat.c
index c70d8a9ca81..cabcc1b06b0 100644
--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -942,6 +942,44 @@ static void test_source_resolver(void)
         video_stream = (IMFMediaStream *)var.punkVal;
     }
 
+    hr = IMFMediaSource_Pause(mediasource);
+    ok(hr == S_OK, "Failed to pause media source, hr %#x.\n", hr);
+    if (get_event((IMFMediaEventGenerator *)mediasource, MESourcePaused, &var))
+        ok(var.vt == VT_EMPTY, "Unexpected value type.\n");
+
+    var.vt = VT_EMPTY;
+    hr = IMFMediaSource_Start(mediasource, descriptor, &GUID_NULL, &var);
+    ok(hr == S_OK, "Failed to start media source, hr %#x.\n", hr);
+
+    if (get_event((IMFMediaEventGenerator *)mediasource, MESourceStarted, &var))
+        ok(var.vt == VT_EMPTY, "Unexpected value type.\n");
+
+    hr = IMFMediaSource_Pause(mediasource);
+    ok(hr == S_OK, "Failed to pause media source, hr %#x.\n", hr);
+    if (get_event((IMFMediaEventGenerator *)mediasource, MESourcePaused, &var))
+        ok(var.vt == VT_EMPTY, "Unexpected value type.\n");
+
+    var.vt = VT_I8;
+    var.uhVal.QuadPart = 0;
+    hr = IMFMediaSource_Start(mediasource, descriptor, &GUID_NULL, &var);
+    ok(hr == S_OK, "Failed to start media source, hr %#x.\n", hr);
+
+    if (get_event((IMFMediaEventGenerator *)mediasource, MESourceSeeked, &var))
+        ok(var.vt == VT_I8, "Unexpected value type.\n");
+
+    hr = IMFMediaSource_Stop(mediasource);
+    ok(hr == S_OK, "Failed to pause media source, hr %#x.\n", hr);
+    if (get_event((IMFMediaEventGenerator *)mediasource, MESourceStopped, &var))
+        ok(var.vt == VT_EMPTY, "Unexpected value type.\n");
+
+    var.vt = VT_I8;
+    var.uhVal.QuadPart = 0;
+    hr = IMFMediaSource_Start(mediasource, descriptor, &GUID_NULL, &var);
+    ok(hr == S_OK, "Failed to start media source, hr %#x.\n", hr);
+
+    if (get_event((IMFMediaEventGenerator *)mediasource, MESourceStarted, &var))
+        ok(var.vt == VT_I8, "Unexpected value type.\n");
+
     sample_count = 10;
 
     for (i = 0; i < sample_count; ++i)