diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 2bbff730c5..5fee08b29e 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -1207,6 +1207,12 @@ result = <boolean>_(1).isArray();
 result = <boolean>_<any>([]).isArray();
 result = <boolean>_({}).isArray();
 
+// _.isBoolean
+result = <boolean>_.isBoolean(any);
+result = <boolean>_(1).isBoolean();
+result = <boolean>_<any>([]).isBoolean();
+result = <boolean>_({}).isBoolean();
+
 // _.isDate
 result = <boolean>_.isDate(any);
 result = <boolean>_(42).isDate();
@@ -1479,8 +1485,6 @@ interface FirstSecond {
 }
 result = <FirstSecond>_.invert({ 'first': 'moe', 'second': 'larry' });
 
-result = <boolean>_.isBoolean(null);
-
 result = <boolean>_.isElement(document.body);
 
 // _.isEqual (alias: _.eq)
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 11f32f2a3a..9815f472b4 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -6196,6 +6196,23 @@ declare module _ {
         isArray(): boolean;
     }
 
+    //_.isBoolean
+    interface LoDashStatic {
+        /**
+         * Checks if value is classified as a boolean primitive or object.
+         * @param value The value to check.
+         * @return Returns true if value is correctly classified, else false.
+         **/
+        isBoolean(value?: any): boolean;
+    }
+
+    interface LoDashWrapperBase<T, TWrapper> {
+        /**
+         * @see _.isBoolean
+         */
+        isBoolean(): boolean;
+    }
+
     //_.isDate
     interface LoDashStatic {
         /**
@@ -7080,16 +7097,6 @@ declare module _ {
         invert(object: any): any;
     }
 
-    //_.isBoolean
-    interface LoDashStatic {
-        /**
-        * Checks if value is a boolean value.
-        * @param value The value to check.
-        * @return True if the value is a boolean value, else false.
-        **/
-        isBoolean(value?: any): boolean;
-    }
-
     //_.isElement
     interface LoDashStatic {
         /**