diff --git a/CHANGES b/CHANGES
index 1a17e3f1d..44a6aed42 100644
--- a/CHANGES
+++ b/CHANGES
@@ -27,6 +27,7 @@ Bugfixes:
  - SDL: Fix potential race condition when pressing keys (fixes mgba.io/i/872)
  - GBA: Fix keypad IRQs not firing when extra buttons are pressed
  - GBA Video: Fix broken sprite blending hack (fixes mgba.io/i/532)
+ - GBA I/O: Fix reading from a few invalid I/O registers (fixes mgba.io/i/876)
 Misc:
  - Qt: Don't rebuild library view if style hasn't changed
  - SDL: Fix 2.0.5 build on macOS under some circumstances
diff --git a/src/gba/io.c b/src/gba/io.c
index 4d36f2800..9dcdd98ee 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -889,14 +889,17 @@ uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
 		break;
 	case REG_MAX:
 		// Some bad interrupt libraries will read from this
-		break;
-	case 0x66:
-	case 0x6E:
-	case 0x76:
-	case 0x7A:
-	case 0x7E:
-	case 0x86:
-	case 0x8A:
+	case 0x066:
+	case 0x06E:
+	case 0x076:
+	case 0x07A:
+	case 0x07E:
+	case 0x086:
+	case 0x08A:
+	case 0x136:
+	case 0x142:
+	case 0x15A:
+	case 0x206:
 		mLOG(GBA_IO, GAME_ERROR, "Read from unused I/O register: %03X", address);
 		return 0;
 	case REG_DEBUG_ENABLE: