diff --git a/src/__TEST__/range.spec.ts b/src/__TEST__/range.spec.ts
index 84ebcbd..62a7342 100644
--- a/src/__TEST__/range.spec.ts
+++ b/src/__TEST__/range.spec.ts
@@ -272,6 +272,47 @@ describe(`rangeFactory`, () => {
     })
   })
 
+  const { resolver: ExampleZeroStart } = rangeFactory({
+    name: `ExampleRange`,
+    start: 0,
+    end: 1
+  })
+
+  describe(`valid:allowsZero`, () => {
+    describe(`as int`, () => {
+      it(`serialize`, () => {
+        expect(ExampleZeroStart.serialize(0)).toBe(0)
+      })
+
+      it(`parseValue`, () => {
+        expect(ExampleZeroStart.parseValue(0)).toBe(0)
+      })
+
+      it(`parseLiteral`, () => {
+        expect(
+          // @ts-ignore
+          ExampleZeroStart.parseLiteral({ value: 0, kind: Kind.INT }, {})
+        ).toBe(0)
+      })
+    })
+
+    describe(`as string`, () => {
+      it(`serialize`, () => {
+        expect(ExampleZeroStart.serialize(`0`)).toBe(0)
+      })
+
+      it(`parseValue`, () => {
+        expect(ExampleZeroStart.parseValue(`0`)).toBe(0)
+      })
+
+      it(`parseLiteral`, () => {
+        expect(
+          ExampleZeroStart.parseLiteral({ value: `0`, kind: Kind.INT }, {})
+        ).toBe(0)
+      })
+    })
+  })
+
   const { resolver: ExampleFloatRange } = rangeFactory({
     name: `ExampleFloatRange`,
     start: 0.25,
diff --git a/src/range.ts b/src/range.ts
index fd8a7e3..7c0e97a 100644
--- a/src/range.ts
+++ b/src/range.ts
@@ -14,7 +14,7 @@ export const rangeFactory = ({ name, start, end, float = false }: Config) => {
       .typeError(`Value is not a number: ${value}`)
       .notOneOf([Infinity, -Infinity], `Value is not a finite number: ${value}`)
       .required(`Value is not a number: ${value}`)
-      .positive(`Value is not a positive number: ${value}`)
+      .min(0, `Value is not a positive number: ${value}`)
       .validateSync(value)
     if (!float) {
       yupNumber()
diff --git a/src/url.ts b/src/url.ts
index 12210f5..d664198 100644
--- a/src/url.ts
+++ b/src/url.ts
@@ -6,15 +6,11 @@ const validate = (value: string) =>
   yupString()
     .strict(true)
     .typeError(`Value is not string: ${value}`)
-    .test(`uri`, `Value is not a valid URL: ${value}`, val => {
-      try {
-        const result = parse(val as string)
-        if (!result.scheme) return false
-        return true
-      } catch (err) {
-        return false
-      }
-    })
+    .test(
+      `uri`,
+      `Value is not a valid URL: ${value}`,
+      val => !!parse(val as string).scheme
+    )
     .validateSync(value)
 
 export const URLScalar = `scalar URL`