diff --git a/packages/mdc-ripple/foundation.js b/packages/mdc-ripple/foundation.js
index c1136f4e2e7..14104782b96 100644
--- a/packages/mdc-ripple/foundation.js
+++ b/packages/mdc-ripple/foundation.js
@@ -106,17 +106,6 @@ class MDCRippleFoundation extends MDCFoundation {
     };
   }
 
-  /**
-   * We compute this property so that we are not querying information about the client
-   * until the point in time where the foundation requests it. This prevents scenarios where
-   * client-side feature-detection may happen too early, such as when components are rendered on the server
-   * and then initialized at mount time on the client.
-   * @return {boolean}
-   */
-  get isSupported_() {
-    return this.adapter_.browserSupportsCssVars();
-  }
-
   constructor(adapter) {
     super(Object.assign(MDCRippleFoundation.defaultAdapter, adapter));
 
@@ -187,6 +176,18 @@ class MDCRippleFoundation extends MDCFoundation {
     };
   }
 
+  /**
+   * We compute this property so that we are not querying information about the client
+   * until the point in time where the foundation requests it. This prevents scenarios where
+   * client-side feature-detection may happen too early, such as when components are rendered on the server
+   * and then initialized at mount time on the client.
+   * @return {boolean}
+   * @private
+   */
+  isSupported_() {
+    return this.adapter_.browserSupportsCssVars();
+  }
+
   /**
    * @return {!ActivationStateType}
    */
@@ -203,7 +204,7 @@ class MDCRippleFoundation extends MDCFoundation {
   }
 
   init() {
-    if (!this.isSupported_) {
+    if (!this.isSupported_()) {
       return;
     }
     this.addEventListeners_();
@@ -266,8 +267,11 @@ class MDCRippleFoundation extends MDCFoundation {
     });
   }
 
-  activate() {
-    this.activate_(null);
+  /**
+   * @param {?Event=} event Optional event containing position information.
+   */
+  activate(event = null) {
+    this.activate_(event);
   }
 
   /** @private */
@@ -405,8 +409,11 @@ class MDCRippleFoundation extends MDCFoundation {
     });
   }
 
-  deactivate() {
-    this.deactivate_(null);
+  /**
+   * @param {?Event=} event Optional event containing position information.
+   */
+  deactivate(event = null) {
+    this.deactivate_(event);
   }
 
   /**
@@ -424,7 +431,7 @@ class MDCRippleFoundation extends MDCFoundation {
   }
 
   destroy() {
-    if (!this.isSupported_) {
+    if (!this.isSupported_()) {
       return;
     }
     this.removeEventListeners_();