diff --git a/src/plugins/directshow/player/directshowioreader.cpp b/src/plugins/directshow/player/directshowioreader.cpp
index e5a841f7..3f61230d 100644
--- a/src/plugins/directshow/player/directshowioreader.cpp
+++ b/src/plugins/directshow/player/directshowioreader.cpp
@@ -429,7 +429,7 @@ HRESULT DirectShowIOReader::blockingRead(
     *bytesRead = m_device->read(reinterpret_cast<char *>(buffer), maxBytes);
 
     if (*bytesRead != length) {
-        qMemSet(buffer + *bytesRead, 0, length - *bytesRead);
+        ::memset(buffer + *bytesRead, 0, length - *bytesRead);
 
         return S_FALSE;
     } else {
@@ -459,7 +459,7 @@ bool DirectShowIOReader::nonBlockingRead(
             *bytesRead = m_device->read(reinterpret_cast<char *>(buffer), maxBytes);
 
             if (*bytesRead != length) {
-                qMemSet(buffer + *bytesRead, 0, length - *bytesRead);
+                ::memset(buffer + *bytesRead, 0, length - *bytesRead);
 
                 *result = S_FALSE;
             } else {
diff --git a/src/plugins/directshow/player/directshowiosource.cpp b/src/plugins/directshow/player/directshowiosource.cpp
index 190b5b79..8bad33e9 100644
--- a/src/plugins/directshow/player/directshowiosource.cpp
+++ b/src/plugins/directshow/player/directshowiosource.cpp
@@ -527,7 +527,7 @@ HRESULT DirectShowIOSource::QueryPinInfo(PIN_INFO *pInfo)
 
         const int bytes = qMin(MAX_FILTER_NAME, (m_pinId.length() + 1) * 2);
 
-        qMemCopy(pInfo->achName, m_pinId.utf16(), bytes);
+        ::memcpy(pInfo->achName, m_pinId.utf16(), bytes);
 
         return S_OK;
     }
@@ -542,7 +542,7 @@ HRESULT DirectShowIOSource::QueryId(LPWSTR *Id)
 
         *Id = static_cast<LPWSTR>(::CoTaskMemAlloc(bytes));
 
-        qMemCopy(*Id, m_pinId.utf16(), bytes);
+        ::memcpy(*Id, m_pinId.utf16(), bytes);
 
         return S_OK;
     }
diff --git a/src/plugins/directshow/player/videosurfacefilter.cpp b/src/plugins/directshow/player/videosurfacefilter.cpp
index 84bd9cf8..5accfed8 100644
--- a/src/plugins/directshow/player/videosurfacefilter.cpp
+++ b/src/plugins/directshow/player/videosurfacefilter.cpp
@@ -396,7 +396,7 @@ HRESULT VideoSurfaceFilter::QueryPinInfo(PIN_INFO *pInfo)
 
         const int bytes = qMin(MAX_FILTER_NAME, (m_pinId.length() + 1) * 2);
 
-        qMemCopy(pInfo->achName, m_pinId.utf16(), bytes);
+        ::memcpy(pInfo->achName, m_pinId.utf16(), bytes);
 
         return S_OK;
     }
@@ -411,7 +411,7 @@ HRESULT VideoSurfaceFilter::QueryId(LPWSTR *Id)
 
         *Id = static_cast<LPWSTR>(::CoTaskMemAlloc(bytes));
 
-        qMemCopy(*Id, m_pinId.utf16(), bytes);
+        ::memcpy(*Id, m_pinId.utf16(), bytes);
 
         return S_OK;
     }