diff --git a/0.2-elliptic-curve-math.ipynb b/0.2-elliptic-curve-math.ipynb
index 1963dc81d..db8c37064 100644
--- a/0.2-elliptic-curve-math.ipynb
+++ b/0.2-elliptic-curve-math.ipynb
@@ -187,10 +187,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "a = random.randrange(SECP256K1_ORDER / 2, SECP256K1_ORDER)\n",
+    "a = random.randrange(int(SECP256K1_ORDER / 2), SECP256K1_ORDER)\n",
     "a_key = ECKey().set(a) \n",
     "\n",
-    "b = random.randrange(SECP256K1_ORDER / 2, SECP256K1_ORDER)\n",
+    "b = random.randrange(int(SECP256K1_ORDER / 2), SECP256K1_ORDER)\n",
     "b_key = ECKey().set(b) \n",
     "\n",
     "# Left: Compute a + b as ints (modulo the sepc256k1 group order)\n",