diff --git a/types/materialize-css/index.d.ts b/types/materialize-css/index.d.ts
index f1540ff597..a4056b75d2 100644
--- a/types/materialize-css/index.d.ts
+++ b/types/materialize-css/index.d.ts
@@ -193,7 +193,7 @@ declare global {
              * Render days of the calendar grid that fall in the next or previous month.
              * @default false
              */
-            showDaysInNextAndPreviousMonths: false;
+            showDaysInNextAndPreviousMonths: boolean;
 
             /**
              * Specify a selector for a DOM element to render the calendar in, by default it will be placed before the input.
@@ -673,10 +673,10 @@ declare global {
         autocomplete(method: keyof Pick<M.Autocomplete, "updateData">, data: M.AutocompleteData): JQuery;
         autocomplete(options?: Partial<M.AutocompleteOptions>): JQuery;
 
-        datePicker(method: keyof Pick<M.DatePicker, "open" | "close" | "destroy">): JQuery;
-        datePicker(method: keyof Pick<M.DatePicker, "setDate">, date?: Date): JQuery;
-        datePicker(method: keyof Pick<M.DatePicker, "gotoDate">, date: Date): JQuery;
-        datePicker(options?: Partial<M.DatePickerOptions>): JQuery;
+        datepicker(method: keyof Pick<M.DatePicker, "open" | "close" | "destroy">): JQuery;
+        datepicker(method: keyof Pick<M.DatePicker, "setDate">, date?: Date): JQuery;
+        datepicker(method: keyof Pick<M.DatePicker, "gotoDate">, date: Date): JQuery;
+        datepicker(options?: Partial<M.DatePickerOptions>): JQuery;
 
         floatingActionButton(method: keyof Pick<M.FloatingActionButton, "open" | "close" | "destroy">): JQuery;
         floatingActionButton(options?: Partial<M.FloatingActionButtonOptions>): JQuery;
diff --git a/types/materialize-css/test/materialize-css-jquery.test.ts b/types/materialize-css/test/materialize-css-jquery.test.ts
index 0a70184881..c463044df2 100644
--- a/types/materialize-css/test/materialize-css-jquery.test.ts
+++ b/types/materialize-css/test/materialize-css-jquery.test.ts
@@ -36,9 +36,9 @@ $(".whatever").floatingActionButton("destroy");
 
 // Toast can not be invoked using jQuery.
 
-$(".whatever").datePicker();
-$(".whatever").datePicker({ defaultDate: new Date() });
-$(".whatever").datePicker("open");
-$(".whatever").datePicker("destroy");
-$(".whatever").datePicker("setDate", new Date());
-$(".whatever").datePicker("gotoDate", new Date());
+$(".whatever").datepicker();
+$(".whatever").datepicker({ defaultDate: new Date() });
+$(".whatever").datepicker("open");
+$(".whatever").datepicker("destroy");
+$(".whatever").datepicker("setDate", new Date());
+$(".whatever").datepicker("gotoDate", new Date());