diff --git a/packages/mosaic/timepicker/timepicker.spec.ts b/packages/mosaic/timepicker/timepicker.spec.ts
index b9860bcd0..ac4a8ccf7 100644
--- a/packages/mosaic/timepicker/timepicker.spec.ts
+++ b/packages/mosaic/timepicker/timepicker.spec.ts
@@ -221,6 +221,31 @@ describe('McTimepicker', () => {
                         'broken fallback to default time format');
                 });
         });
+
+        it('When the format updates', () => {
+            testComponent.timeFormat = 'HH:mm:ss';
+            testComponent.timeValue = moment('1970-01-01 00:00:00');
+            fixture.detectChanges();
+
+            return fixture.whenStable()
+                .then(() => {
+                    expect(inputElementDebug.nativeElement.value).toBe(
+                        '00:00:00',
+                        'mismatch time format'
+                    );
+
+                    testComponent.timeFormat = 'HH:mm';
+                    fixture.detectChanges();
+
+                    return fixture.whenStable();
+                })
+                .then(() => {
+                    expect(inputElementDebug.nativeElement.value).toBe(
+                        '00:00',
+                        'mismatch time format'
+                    );
+                });
+        });
     });
 
     describe('Convert user input', () => {
diff --git a/packages/mosaic/timepicker/timepicker.ts b/packages/mosaic/timepicker/timepicker.ts
index bbe106b66..10e126652 100644
--- a/packages/mosaic/timepicker/timepicker.ts
+++ b/packages/mosaic/timepicker/timepicker.ts
@@ -201,8 +201,9 @@ export class McTimepicker<D> extends McTimepickerMixinBase
             .map((timeFormatKey) => TimeFormats[timeFormatKey])
             .indexOf(formatValue) > -1 ? formatValue : DEFAULT_TIME_FORMAT;
 
-        (this.ngControl.control as FormControl).updateValueAndValidity();
         this.placeholder = TIMEFORMAT_PLACEHOLDERS[this._timeFormat];
+
+        setTimeout(() => this.applyInputChanges({ doTimestringReformat: true }));
     }
 
     private _timeFormat: TimeFormats;