diff --git a/lib/schema/boolean.js b/lib/schema/boolean.js
index 099270c2136..f90c86a6c2f 100644
--- a/lib/schema/boolean.js
+++ b/lib/schema/boolean.js
@@ -52,15 +52,25 @@ SchemaBoolean.prototype.checkRequired = function(value) {
  * Casts to boolean
  *
  * @param {Object} value
+ * @param {Object} model - this value is optional
  * @api private
  */
 
-SchemaBoolean.prototype.cast = function(value) {
+SchemaBoolean.prototype.cast = function(value, model) {
   if (value === null) {
     return value;
   }
 
-  if (!this.options.strictBool) {
+  if (this.options.strictBool || (model && model.schema.options.strictBool && this.options.strictBool !== false)) {
+    // strict mode (throws if value is not a boolean, instead of converting)
+    if (value === true || value === 'true' || value === 1 || value === '1') {
+      return true;
+    }
+    if (value === false || value === 'false' || value === 0 || value === '0') {
+      return false;
+    }
+    throw new CastError('boolean', value, this.path);
+  } else {
     // legacy mode
     if (value === '0') {
       return false;
@@ -72,15 +82,6 @@ SchemaBoolean.prototype.cast = function(value) {
       return false;
     }
     return !!value;
-  } else {
-    // strict mode (throws if value is not a boolean, instead of converting)
-    if (value === true || value === 'true' || value === 1 || value === '1') {
-      return true;
-    }
-    if (value === false || value === 'false' || value === 0 || value === '0') {
-      return false;
-    }
-    throw new CastError('boolean', value, this.path);
   }
 };
 
diff --git a/test/schema.boolean.test.js b/test/schema.boolean.test.js
index d367bb78ca3..59b77b916aa 100644
--- a/test/schema.boolean.test.js
+++ b/test/schema.boolean.test.js
@@ -29,6 +29,7 @@ describe('schematype', function() {
       assert.strictEqual(true, m3.b);
       done();
     });
+
     it('strictBool option (gh-5211)', function(done) {
       var db = start(),
           s1 = new Schema({b: {type: Boolean, strictBool: true}}),
@@ -51,7 +52,37 @@ describe('schematype', function() {
           }
         });
       });
+    });
+
+    it('strictBool schema option', function(done) {
+      var db = start(),
+          s1 = new Schema({b: {type: Boolean}}, {strictBool: true}),
+          M1 = db.model('StrictBoolTrue', s1);
+      db.close();
 
+      var strictValues = [true, false, 'true', 'false', 0, 1, '0', '1'];
+
+      strictValues.forEach(function(value) {
+        var doc = new M1;
+        doc.b = value;
+        doc.validate(function(error) {
+          if (error) {
+            // test fails as soon as one value fails
+            return done(error);
+          }
+        });
+      });
+
+      var doc = new M1;
+      doc.b = 'Not a boolean';
+      doc.validate(function(error) {
+        if (error) {
+          done();
+        } else {
+          done(new Error('ValidationError expected'));
+        }
+      });
     });
+
   });
 });