diff --git a/libs/clipboard/src/windows/wf_cliprdr.c b/libs/clipboard/src/windows/wf_cliprdr.c
index 7c1448c4a..6927bcc57 100644
--- a/libs/clipboard/src/windows/wf_cliprdr.c
+++ b/libs/clipboard/src/windows/wf_cliprdr.c
@@ -715,7 +715,9 @@ static CliprdrStream *CliprdrStream_New(UINT32 connID, ULONG index, void *pData,
 
 				if (req_data != NULL && req_sz >= sizeof(LONGLONG))
 				{
-					instance->m_lSize.QuadPart = *((LONGLONG *)req_data);
+					LONGLONG sz = 0;
+					CopyMemory(&sz, req_data, sizeof(sz));
+					instance->m_lSize.QuadPart = sz;
 				}
 				else
 				{