diff --git a/src/tokenlist.schema.json b/src/tokenlist.schema.json
index 02811a23..987e0f13 100644
--- a/src/tokenlist.schema.json
+++ b/src/tokenlist.schema.json
@@ -80,7 +80,7 @@
           "type": "integer",
           "description": "The number of decimals for the token balance; if not set, defaults to on-chain data",
           "minimum": 0,
-          "maximum": 78
+          "maximum": 255
         },
         "name": {
           "type": "string",
diff --git a/test/__snapshots__/tokenlist.schema.test.ts.snap b/test/__snapshots__/tokenlist.schema.test.ts.snap
index 971cdc9d..799ef588 100644
--- a/test/__snapshots__/tokenlist.schema.test.ts.snap
+++ b/test/__snapshots__/tokenlist.schema.test.ts.snap
@@ -92,6 +92,38 @@ Array [
 ]
 `;
 
+exports[`schema invalid decimals 1`] = `
+Array [
+  Object {
+    "dataPath": ".tokens[0].decimals",
+    "keyword": "maximum",
+    "message": "should be <= 255",
+    "params": Object {
+      "comparison": "<=",
+      "exclusive": false,
+      "limit": 255,
+    },
+    "schemaPath": "#/properties/decimals/maximum",
+  },
+]
+`;
+
+exports[`schema invalid decimals 2`] = `
+Array [
+  Object {
+    "dataPath": ".tokens[0].decimals",
+    "keyword": "minimum",
+    "message": "should be >= 0",
+    "params": Object {
+      "comparison": ">=",
+      "exclusive": false,
+      "limit": 0,
+    },
+    "schemaPath": "#/properties/decimals/minimum",
+  },
+]
+`;
+
 exports[`schema invalid logo URI 1`] = `
 Array [
   Object {
diff --git a/test/schema/invaliddecimals.1.tokenlist.json b/test/schema/invaliddecimals.1.tokenlist.json
new file mode 100644
index 00000000..99e6575c
--- /dev/null
+++ b/test/schema/invaliddecimals.1.tokenlist.json
@@ -0,0 +1,31 @@
+{
+  "name": "My Example List",
+  "keywords": [
+    "abc"
+  ],
+  "tags": {
+    "1": {
+      "name": "tag 1",
+      "description": "blah blah"
+    }
+  },
+  "timestamp": "2018-11-13T20:20:39+00:00",
+  "tokens": [
+    {
+      "name": "name",
+      "address": "0x0000000000000000000000000000000000000000",
+      "chainId": 1,
+      "decimals": 256,
+      "logoURI": "https://test",
+      "symbol": "abc",
+      "tags": [
+        "coin"
+      ]
+    }
+  ],
+  "version": {
+    "major": 0,
+    "minor": 0,
+    "patch": 1
+  }
+}
\ No newline at end of file
diff --git a/test/schema/invaliddecimals.2.tokenlist.json b/test/schema/invaliddecimals.2.tokenlist.json
new file mode 100644
index 00000000..99631b62
--- /dev/null
+++ b/test/schema/invaliddecimals.2.tokenlist.json
@@ -0,0 +1,31 @@
+{
+  "name": "My Example List",
+  "keywords": [
+    "abc"
+  ],
+  "tags": {
+    "1": {
+      "name": "tag 1",
+      "description": "blah blah"
+    }
+  },
+  "timestamp": "2018-11-13T20:20:39+00:00",
+  "tokens": [
+    {
+      "name": "name",
+      "address": "0x0000000000000000000000000000000000000000",
+      "chainId": 1,
+      "decimals": -1,
+      "logoURI": "https://test",
+      "symbol": "abc",
+      "tags": [
+        "coin"
+      ]
+    }
+  ],
+  "version": {
+    "major": 0,
+    "minor": 0,
+    "patch": 1
+  }
+}
\ No newline at end of file
diff --git a/test/tokenlist.schema.test.ts b/test/tokenlist.schema.test.ts
index 0f88ae69..3e16c3cd 100644
--- a/test/tokenlist.schema.test.ts
+++ b/test/tokenlist.schema.test.ts
@@ -9,6 +9,8 @@ import invalidLogoURI from './schema/invalidlogouri.tokenlist.json';
 import invalidVersion1 from './schema/invalidversion.1.tokenlist.json';
 import invalidVersion2 from './schema/invalidversion.2.tokenlist.json';
 import invalidVersion3 from './schema/invalidversion.3.tokenlist.json';
+import invalidDecimals1 from './schema/invaliddecimals.1.tokenlist.json';
+import invalidDecimals2 from './schema/invaliddecimals.2.tokenlist.json';
 
 const ajv = new Ajv({ allErrors: true, format: 'full' });
 const validator = ajv.compile(schema);
@@ -53,6 +55,11 @@ describe('schema', () => {
     checkSchema(invalidLogoURI, false);
   });
 
+  it('invalid decimals', () => {
+    checkSchema(invalidDecimals1, false);
+    checkSchema(invalidDecimals2, false);
+  });
+
   it('checks version', () => {
     checkSchema(invalidVersion1, false);
     checkSchema(invalidVersion2, false);