diff --git a/rpcs3/Emu/Cell/RawSPUThread.cpp b/rpcs3/Emu/Cell/RawSPUThread.cpp
index 10dfc9de6e..f122fa9a61 100644
--- a/rpcs3/Emu/Cell/RawSPUThread.cpp
+++ b/rpcs3/Emu/Cell/RawSPUThread.cpp
@@ -141,8 +141,8 @@ bool RawSPUThread::write_reg(const u32 addr, const u32 value)
 
 	case MFC_Size_Tag_offs:
 	{
-		g_tls_mfc[index].tag = value & 0xff;
-		g_tls_mfc[index].size = value >> 16;
+		g_tls_mfc[index].tag = value & 0x1f;
+		g_tls_mfc[index].size = (value >> 16) & 0x7fff;
 		return true;
 	}
 
diff --git a/rpcs3/Emu/Cell/SPUThread.cpp b/rpcs3/Emu/Cell/SPUThread.cpp
index 40c660329b..2eca529ee6 100644
--- a/rpcs3/Emu/Cell/SPUThread.cpp
+++ b/rpcs3/Emu/Cell/SPUThread.cpp
@@ -1422,13 +1422,13 @@ bool SPUThread::set_ch_value(u32 ch, u32 value)
 
 	case MFC_Size:
 	{
-		ch_mfc_cmd.size = value & 0xffff;
+		ch_mfc_cmd.size = value & 0x7fff;
 		return true;
 	}
 
 	case MFC_TagID:
 	{
-		ch_mfc_cmd.tag = value & 0xff;
+		ch_mfc_cmd.tag = value & 0x1f;
 		return true;
 	}