diff --git a/channels/cliprdr/client/cliprdr_main.c b/channels/cliprdr/client/cliprdr_main.c
index 5a9c40a88..fc88dbcf0 100644
--- a/channels/cliprdr/client/cliprdr_main.c
+++ b/channels/cliprdr/client/cliprdr_main.c
@@ -66,14 +66,16 @@ static UINT cliprdr_packet_send(cliprdrPlugin* cliprdr, wStream* s)
 	WINPR_ASSERT(s);
 
 	const size_t pos = Stream_GetPosition(s);
-	const size_t dataLen = pos - 8ULL;
-	WINPR_ASSERT(dataLen <= UINT32_MAX);
+	WINPR_ASSERT(pos >= 8ULL);
+	WINPR_ASSERT(pos <= UINT32_MAX - 8);
+
+	const uint32_t dataLen = WINPR_ASSERTING_INT_CAST(uint32_t, pos - 8UL);
 
 	Stream_SetPosition(s, 4);
-	Stream_Write_UINT32(s, (UINT32)dataLen);
+	Stream_Write_UINT32(s, dataLen);
 	Stream_SetPosition(s, pos);
 
-	WLog_Print(cliprdr->log, WLOG_DEBUG, "Cliprdr Sending (%" PRIuz " bytes)", dataLen + 8UL);
+	WLog_Print(cliprdr->log, WLOG_DEBUG, "Cliprdr Sending (%" PRIuz " bytes)", pos);
 
 	if (!cliprdr)
 	{