diff --git a/asm/creole.py b/asm/creole.py
index 3746003..1d98051 100644
--- a/asm/creole.py
+++ b/asm/creole.py
@@ -91,7 +91,7 @@ class Instruction(Enum):
 	ADD = 3, ArgType.REG, ArgType.VAL, ArgType.VAL
 	MUL = 4, ArgType.REG, ArgType.VAL, ArgType.VAL
 	DIV = 5, ArgType.REG, ArgType.VAL, ArgType.VAL
-	IDIV = 6, ArgType.REG, ArgType.VAL, ArgType.VAL
+	SDIV = 6, ArgType.REG, ArgType.VAL, ArgType.VAL
 	JL = 7, ArgType.LAB, ArgType.VAL, ArgType.VAL
 	CLB = 8, ArgType.LAB
 	SYS = 9, ArgType.VAL
diff --git a/asm/test.py b/asm/test.py
index 1274d9c..4b6471c 100644
--- a/asm/test.py
+++ b/asm/test.py
@@ -267,16 +267,16 @@ class DivTest(unittest.TestCase):
 		ex = ffi.Environment(p())
 		self.assertEqual(ex(), ffi.RunRet.DIVIDE_BY_ZERO)
 
-	def test_idiv_by_zero(self):
+	def test_sdiv_by_zero(self):
 		p = Program()
-		p.parse_asm_line("idiv r0 8 0")
+		p.parse_asm_line("sdiv r0 8 0")
 		ex = ffi.Environment(p())
 		self.assertEqual(ex(), ffi.RunRet.DIVIDE_BY_ZERO)
 
-	def test_div_neg(self):
+	def test_sdiv_neg(self):
 		p = Program()
-		p.parse_asm_line("idiv r0 16 -4")
-		p.parse_asm_line("idiv r1 r0 -4")
+		p.parse_asm_line("sdiv r0 16 -4")
+		p.parse_asm_line("sdiv r1 r0 -4")
 		ex = ffi.Environment(p())
 		self.assertEqual(ex(), ffi.RunRet.STOP)
 		self.assertEqual(ex.getreg(0), -4)
diff --git a/creole.c b/creole.c
index 8865939..135576f 100644
--- a/creole.c
+++ b/creole.c
@@ -35,7 +35,7 @@ static const struct {
 	defop(ADD, 3, TYPE_REG, TYPE_VAL, TYPE_VAL),
 	defop(MUL, 3, TYPE_REG, TYPE_VAL, TYPE_VAL),
 	defop(DIV, 3, TYPE_REG, TYPE_VAL, TYPE_VAL),
-	defop(IDIV, 3, TYPE_REG, TYPE_VAL, TYPE_VAL),
+	defop(SDIV, 3, TYPE_REG, TYPE_VAL, TYPE_VAL),
 	defop(JL, 3, TYPE_LAB, TYPE_VAL, TYPE_VAL),
 	defop(CLB, 1, TYPE_LAB, TYPE_NONE, TYPE_NONE),
 	defop(SYS, 1, TYPE_VAL, TYPE_NONE, TYPE_NONE)
@@ -548,7 +548,7 @@ enum creole_run_ret creole_step(struct creole_env *env, creole_word *sc)
 			return CREOLE_DIV_BY_ZERO;
 		check(creole_reg_write(env, ins->w[0], a1 / a2));
 		break;
-	case CREOLE_IDIV:
+	case CREOLE_SDIV:
 		check(read_val(env, ins, 1, &a1));
 		check(read_val(env, ins, 2, &a2));
 		if (a2 == 0)
diff --git a/creole.h b/creole.h
index 0e84a72..452bc91 100644
--- a/creole.h
+++ b/creole.h
@@ -23,7 +23,7 @@ enum creole_opcode {
 	CREOLE_ADD = 3,
 	CREOLE_MUL = 4,
 	CREOLE_DIV = 5,
-	CREOLE_IDIV = 6,
+	CREOLE_SDIV = 6,
 	CREOLE_JL = 7,
 	CREOLE_CLB = 8,
 	CREOLE_SYS = 9,