diff --git a/types/jquery.stickem/index.d.ts b/types/jquery.stickem/index.d.ts
index 6b223805ec..50e759635e 100644
--- a/types/jquery.stickem/index.d.ts
+++ b/types/jquery.stickem/index.d.ts
@@ -40,12 +40,12 @@ interface StickemSettings {
     /**
      * Callback to execute when in stick state
      */
-    onStick?: Function,
+    onStick?: () => void;
 
     /**
      * Callback to execute when getting out of stick state
      */
-    onUnstick?: Function
+    onUnstick?: () => void;
 }
 
 interface JQuery {
diff --git a/types/jquery.stickem/jquery.stickem-tests.ts b/types/jquery.stickem/jquery.stickem-tests.ts
index 37fb586280..572bdf7773 100644
--- a/types/jquery.stickem/jquery.stickem-tests.ts
+++ b/types/jquery.stickem/jquery.stickem-tests.ts
@@ -16,4 +16,4 @@ jQuery('div').stickem({
     container: '.stickem-container',
     stickClass: 'stickit',
     endStickClass: 'stickit-end'
-});
\ No newline at end of file
+});