diff --git a/src/gba/io.c b/src/gba/io.c
index 8088af38e..9dc66b94d 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -226,7 +226,7 @@ static const int _isValidRegister[REG_MAX >> 1] = {
 	1, 1, 1, 1, 1, 0, 0, 0,
 	1, 1, 1, 0, 0, 0, 0, 0,
 	1, 0, 0, 0, 0, 0, 0, 0,
-	1, 0, 1, 0, 1, 0, 0, 0,
+	1, 1, 1, 1, 1, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
@@ -268,7 +268,7 @@ static const int _isRSpecialRegister[REG_MAX >> 1] = {
 	1, 1, 1, 1, 1, 0, 0, 0,
 	1, 1, 1, 0, 0, 0, 0, 0,
 	1, 0, 0, 0, 0, 0, 0, 0,
-	1, 0, 1, 0, 1, 0, 0, 0,
+	1, 1, 1, 1, 1, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
@@ -309,7 +309,7 @@ static const int _isWSpecialRegister[REG_MAX >> 1] = {
 	1, 1, 1, 1, 1, 0, 0, 0,
 	1, 1, 1, 0, 0, 0, 0, 0,
 	1, 0, 0, 0, 0, 0, 0, 0,
-	1, 0, 1, 0, 1, 0, 0, 0,
+	1, 1, 1, 1, 1, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,