diff --git a/CHANGES b/CHANGES
index 521c109e4..f157b549c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3,6 +3,7 @@ Bugfixes:
  - Qt: More app metadata fixes
  - Qt: Fix load recent from archive (fixes mgba.io/i/1325)
  - GB Video: Delay LYC STAT check (fixes mgba.io/i/1331)
+ - GB Video: Fix window being enabled mid-scanline (fixes mgba.io/i/1328)
 Misc:
  - Qt: Add missing HEVC NVENC option (fixes mgba.io/i/1323)
 
diff --git a/src/gb/io.c b/src/gb/io.c
index 84b3a35bc..c5f138b60 100644
--- a/src/gb/io.c
+++ b/src/gb/io.c
@@ -465,7 +465,7 @@ void GBIOWrite(struct GB* gb, unsigned address, uint8_t value) {
 		}
 		break;
 	case REG_IE:
-		gb->memory.ie = value;
+		gb->memory.ie = value & 0x1F;
 		GBUpdateIRQs(gb);
 		return;
 	default:
@@ -578,7 +578,7 @@ uint8_t GBIORead(struct GB* gb, unsigned address) {
 	case REG_JOYP:
 		return _readKeysFiltered(gb);
 	case REG_IE:
-		return gb->memory.ie;
+		return gb->memory.ie | 0xE0;
 	case REG_WAVE_0:
 	case REG_WAVE_1:
 	case REG_WAVE_2: