diff --git a/dlls/mfplat/main.c b/dlls/mfplat/main.c
index e80408d2b2a..77edabec2cb 100644
--- a/dlls/mfplat/main.c
+++ b/dlls/mfplat/main.c
@@ -6633,9 +6633,17 @@ static HRESULT WINAPI system_time_source_GetState(IMFPresentationTimeSource *ifa
 
 static HRESULT WINAPI system_time_source_GetProperties(IMFPresentationTimeSource *iface, MFCLOCK_PROPERTIES *props)
 {
-    FIXME("%p, %p.\n", iface, props);
+    TRACE("%p, %p.\n", iface, props);
 
-    return E_NOTIMPL;
+    if (!props)
+        return E_POINTER;
+
+    memset(props, 0, sizeof(*props));
+    props->qwClockFrequency = MFCLOCK_FREQUENCY_HNS;
+    props->dwClockTolerance = MFCLOCK_TOLERANCE_UNKNOWN;
+    props->dwClockJitter = 1;
+
+    return S_OK;
 }
 
 static HRESULT WINAPI system_time_source_GetUnderlyingClock(IMFPresentationTimeSource *iface, IMFClock **clock)
diff --git a/dlls/mfplat/tests/mfplat.c b/dlls/mfplat/tests/mfplat.c
index 7fa3ddd8764..4adfb1b8ad2 100644
--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -2542,6 +2542,7 @@ static void test_system_time_source(void)
     };
     IMFPresentationTimeSource *time_source;
     IMFClockStateSink *statesink;
+    MFCLOCK_PROPERTIES props;
     MFCLOCK_STATE state;
     unsigned int i;
     DWORD value;
@@ -2595,6 +2596,22 @@ static void test_system_time_source(void)
 
     IMFClockStateSink_Release(statesink);
 
+    /* Properties. */
+    hr = IMFPresentationTimeSource_GetProperties(time_source, NULL);
+    ok(hr == E_POINTER, "Unexpected hr %#x.\n", hr);
+
+    hr = IMFPresentationTimeSource_GetProperties(time_source, &props);
+    ok(hr == S_OK, "Failed to get clock properties, hr %#x.\n", hr);
+
+    ok(props.qwCorrelationRate == 0, "Unexpected correlation rate %s.\n",
+            wine_dbgstr_longlong(props.qwCorrelationRate));
+    ok(IsEqualGUID(&props.guidClockId, &GUID_NULL), "Unexpected clock id %s.\n", wine_dbgstr_guid(&props.guidClockId));
+    ok(props.dwClockFlags == 0, "Unexpected flags %#x.\n", props.dwClockFlags);
+    ok(props.qwClockFrequency == MFCLOCK_FREQUENCY_HNS, "Unexpected frequency %s.\n",
+            wine_dbgstr_longlong(props.qwClockFrequency));
+    ok(props.dwClockTolerance == MFCLOCK_TOLERANCE_UNKNOWN, "Unexpected tolerance %u.\n", props.dwClockTolerance);
+    ok(props.dwClockJitter == 1, "Unexpected jitter %u.\n", props.dwClockJitter);
+
     IMFPresentationTimeSource_Release(time_source);
 }
 
diff --git a/include/mfidl.idl b/include/mfidl.idl
index c024e67378b..8855c9a859e 100644
--- a/include/mfidl.idl
+++ b/include/mfidl.idl
@@ -47,6 +47,12 @@ typedef enum MF_OBJECT_TYPE
     MF_OBJECT_INVALID
 } MF_OBJECT_TYPE;
 
+cpp_quote("#define MFCLOCK_FREQUENCY_HNS       10000000")
+cpp_quote("#define MFCLOCK_TOLERANCE_UNKNOWN      50000")
+cpp_quote("#define MFCLOCK_JITTER_ISR              1000")
+cpp_quote("#define MFCLOCK_JITTER_DPC              4000")
+cpp_quote("#define MFCLOCK_JITTER_PASSIVE         10000")
+
 typedef struct _MFCLOCK_PROPERTIES
 {
     unsigned __int64 qwCorrelationRate;