diff --git a/ppu.cpp b/ppu.cpp
index 906774e3..129c0904 100644
--- a/ppu.cpp
+++ b/ppu.cpp
@@ -546,7 +546,7 @@ void S9xSetPPU (uint8 Byte, uint16 Address)
 					PPU.BGMode = Byte & 7;
 					// BJ: BG3Priority only takes effect if BGMode == 1 and the bit is set
 					PPU.BG3Priority = ((Byte & 0x0f) == 0x09);
-					if (PPU.BGMode == 6 || PPU.BGMode == 5)
+					if (PPU.BGMode == 6 || PPU.BGMode == 5 || PPU.BGMode == 7)
 					    IPPU.Interlace = Memory.FillRAM[0x2133] & 1;
 					else
 					    IPPU.Interlace = 0;