diff --git a/pcsx2/Sio.cpp b/pcsx2/Sio.cpp
index c21941197d..2e765f1a4b 100644
--- a/pcsx2/Sio.cpp
+++ b/pcsx2/Sio.cpp
@@ -433,7 +433,9 @@ SIO_WRITE memcardWrite(u8 data)
 	case 2:
 		transfer_size = data;
 
-		sio.buf[data + 5] = mcd->term;
+		// Note: coverity wrongly detects a buffer overflow. Because data + 5 could be > 512...
+		// So let's add a mask-nop to avoid various useless reports.
+		sio.buf[(data & 0xFF) + 5] = mcd->term;
 		sio.bufSize = data + 5;
 		checksum_pos = data + 4;
 		break;
diff --git a/pcsx2/ps2/Iop/IopHwWrite.cpp b/pcsx2/ps2/Iop/IopHwWrite.cpp
index 7ba715d7ca..788e06d3da 100644
--- a/pcsx2/ps2/Iop/IopHwWrite.cpp
+++ b/pcsx2/ps2/Iop/IopHwWrite.cpp
@@ -270,13 +270,13 @@ static __fi void _HwWrite_16or32_Page1( u32 addr, T val )
 		{
 			// ------------------------------------------------------------------------
 			mcase(HW_SIO_DATA):
-				sioWrite8( (u8)val );
-				sioWrite8( (u8)(val >> 8) );
+				sioWrite8( val & 0xFF );
+				sioWrite8( (val >> 8) & 0xFF );
 				if( sizeof(T) == 4 )
 				{
 					// u32 gets rid of compiler warnings when using the u16 version of this template
-					sioWrite8( (u8)((u32)val >> 16) );
-					sioWrite8( (u8)((u32)val >> 24) );
+					sioWrite8( ((u32)val >> 16) & 0xFF );
+					sioWrite8( ((u32)val >> 24) & 0xFF );
 				}
 			break;