diff --git a/src/dice.ts b/src/dice.ts
index 09941e2..a3bc429 100644
--- a/src/dice.ts
+++ b/src/dice.ts
@@ -33,6 +33,7 @@ export function parseDice(inputStr: string): Dice[] | null {
   const constStrs = (inputStr.match(/([\+|-]\d+)[+|-]/g) || []).map(x => x.slice(0, -1))
     .concat((inputStr.match(/([\+|-]\d+)$/) || []).slice(1)) // trailing
     .concat((inputStr.match(/(^\d+)[+|-]/) || []).slice(1)) // leading
+    .concat((inputStr.match(/^(^\d+)$/) || []).slice(1)) // lone
   const dice = diceStrs.map(ds => {
     const [amount, sides] = ds.split('d').map(d => parseInt(d, 10))
     return { amount: Number.isNaN(amount) ? 1 : amount, sides }
diff --git a/test/dice.test.ts b/test/dice.test.ts
index f4b9808..7e57313 100644
--- a/test/dice.test.ts
+++ b/test/dice.test.ts
@@ -9,7 +9,9 @@ test('Parser', () => {
     { string: '3d8-10', result: [{ amount: 3, sides: 8}, { amount: -10, sides: 1 }] },
     { string: '3dd', result: null },
     { string: '1d6+-1', result: null },
-    { string: 'd6', result: [{ amount: 1, sides: 6 }]}
+    { string: 'd6', result: [{ amount: 1, sides: 6 }]},
+    { string: '10', result: [{ amount: 10, sides: 1}]},
+    { string: '-10', result: [{ amount: -10, sides: 1}]},
   ]
   cases.forEach(({ string, result }) =>
     expect(dice.parseDice(string)).toEqual(result))