diff --git a/src/dasm.c b/src/dasm.c
index 7747c58..0c728e1 100644
--- a/src/dasm.c
+++ b/src/dasm.c
@@ -68,10 +68,10 @@ void print_instruction(unsigned addr, instruction_t inst, unsigned raw)
 			printf("%04x", addr + inst.size - ((raw & 0xFF << 8) + (raw & 0xFF00 >> 8)));
 			break;
 		case REG8:
-			printf("%s", registers8[operand & 0b111000 >> 3]);
+			printf("%s", registers8[(operand & 0b111000) >> 3]);
 			break;
 		case REG16:
-			printf("%s", registers16[operand & 0b111000 >> 3]);
+			printf("%s", registers16[(operand & 0b111000) >> 3]);
 			break;
 		case R_M8:
 			print_rm_operand(inst, raw, operand, false);
diff --git a/src/instructions.c b/src/instructions.c
index 200269b..89b2e76 100644
--- a/src/instructions.c
+++ b/src/instructions.c
@@ -122,7 +122,7 @@ const instruction_t instructions[] = {
 	{.opcode = 0x86, .extended = -1, .name = "xchg", .mode = {R_M8, REG8, END}, .size = 2},
 	{.opcode = 0x87, .extended = -1, .name = "xchg", .mode = {R_M16, REG16, END}, .size = 3},
 	{.opcode = 0x88, .extended = -1, .name = "mov", .mode = {R_M8, REG8, END}, .size = 2},
-	{.opcode = 0x89, .extended = -1, .name = "mov", .mode = {R_M16, REG16, END}, .size = 3},
+	{.opcode = 0x89, .extended = -1, .name = "mov", .mode = {R_M16, REG16, END}, .size = 2},
 	{.opcode = 0x8A, .extended = -1, .name = "mov", .mode = {REG8, R_M8, END}, .size = 2},
 	{.opcode = 0x8B, .extended = -1, .name = "mov", .mode = {REG16, R_M16, END}, .size = 3},
 	// {.opcode = 0x8C, .extended = -1, .name = "mov", .mode = {R_M16, sreg, END}, .size = 3},