diff --git a/src/style-spec/validate/validate_function.js b/src/style-spec/validate/validate_function.js
index f34303a06dc..e38ccce1f29 100644
--- a/src/style-spec/validate/validate_function.js
+++ b/src/style-spec/validate/validate_function.js
@@ -5,7 +5,8 @@ import validate from './validate';
 import validateObject from './validate_object';
 import validateArray from './validate_array';
 import validateNumber from './validate_number';
-import { unbundle } from '../util/unbundle_jsonlint';
+import { isExpression } from '../expression';
+import { unbundle, deepUnbundle } from '../util/unbundle_jsonlint';
 import {
     supportsPropertyExpression,
     supportsZoomExpression,
@@ -138,6 +139,10 @@ export default function validateFunction(options) {
             }, value));
         }
 
+        if (isExpression(deepUnbundle(value[1]))) {
+            return errors.concat([new ValidationError(`${key}[1]`, value[1], 'expressions are not allowed in function stops.')]);
+        }
+
         return errors.concat(validate({
             key: `${key}[1]`,
             value: value[1],
diff --git a/test/unit/style-spec/fixture/functions.input.json b/test/unit/style-spec/fixture/functions.input.json
index 82bc2a06e2c..68c63fda0ad 100644
--- a/test/unit/style-spec/fixture/functions.input.json
+++ b/test/unit/style-spec/fixture/functions.input.json
@@ -967,6 +967,25 @@
         "layout": {
           "line-join": [ "coalesce", ["feature-state", "myState"], "bevel"]
         }
+    }, {
+      "id": "invalid function - expression as stop value",
+      "type": "line",
+      "source": "source",
+      "source-layer": "layer",
+      "paint": {
+        "line-width": {
+          "base": 1,
+          "stops": [
+            [
+              6,
+              [
+                "literal",
+                3
+              ]
+            ]
+          ]
+        }
       }
+    }
   ]
 }
diff --git a/test/unit/style-spec/fixture/functions.output.json b/test/unit/style-spec/fixture/functions.output.json
index c7685c8d7a1..87ec1996fe4 100644
--- a/test/unit/style-spec/fixture/functions.output.json
+++ b/test/unit/style-spec/fixture/functions.output.json
@@ -198,5 +198,9 @@
   {                                                                                                                     
     "message": "layers[55].layout.line-join: \"feature-state\" data expressions are not supported with layout properties.",
     "line": 968
+  },
+  {
+    "message": "layers[56].paint.line-width.stops[0][1]: expressions are not allowed in function stops.",
+    "line": 981
   }
-]
\ No newline at end of file
+]