diff --git a/packages/vue-apollo/src/smart-apollo.js b/packages/vue-apollo/src/smart-apollo.js
index 80114c86..4ca1235e 100644
--- a/packages/vue-apollo/src/smart-apollo.js
+++ b/packages/vue-apollo/src/smart-apollo.js
@@ -112,10 +112,19 @@ export default class SmartApollo {
         cb = this.options.throttle ? throttle(cb, this.options.throttle) : cb
         cb = this.options.debounce ? debounce(cb, this.options.debounce) : cb
       }
-      this._watchers.push(this.vm.$watch(() => this.options.variables.call(this.vm), cb, {
-        immediate: true,
-        deep: this.options.deep,
-      }))
+
+      this._watchers.push(
+        this.vm.$watch(
+          () => typeof this.options.variables === 'function'
+            ? this.options.variables.call(this.vm)
+            : this.options.variables,
+          cb,
+          {
+            immediate: true,
+            deep: this.options.deep,
+          }
+        )
+      )
     } else {
       this.executeApollo(this.options.variables)
     }