diff --git a/src/dialogs/settings/kdenlivesettingsdialog.cpp b/src/dialogs/settings/kdenlivesettingsdialog.cpp
index 75a65e57f9..d5684d9225 100644
--- a/src/dialogs/settings/kdenlivesettingsdialog.cpp
+++ b/src/dialogs/settings/kdenlivesettingsdialog.cpp
@@ -182,23 +182,32 @@ void KdenliveSettingsDialog::initMiscPage()
 
     m_configMisc.kcfg_use_exiftool->setEnabled(!QStandardPaths::findExecutable(QStringLiteral("exiftool")).isEmpty());
 
-    static const QRegularExpression reg(R"((\+|-)?\d{2}:\d{2}:\d{2}(:||,)\d{2})");
+    static const QRegularExpression reg(R"((\+|-)?\d{2}:\d{2}:\d{2}(:||,)\d{2,3})");
     QValidator *validator = new QRegularExpressionValidator(reg, this);
-    m_configMisc.kcfg_color_duration->setInputMask(pCore->timecode().mask());
+    const QString inputMask = pCore->timecode().mask();
+    QSignalBlocker bk1(m_configMisc.kcfg_color_duration);
+    QSignalBlocker bk2(m_configMisc.kcfg_title_duration);
+    QSignalBlocker bk3(m_configMisc.kcfg_transition_duration);
+    QSignalBlocker bk4(m_configMisc.kcfg_mix_duration);
+    QSignalBlocker bk5(m_configMisc.kcfg_image_duration);
+    QSignalBlocker bk6(m_configMisc.kcfg_sequence_duration);
+    QSignalBlocker bk7(m_configMisc.kcfg_fade_duration);
+    QSignalBlocker bk8(m_configMisc.kcfg_subtitle_duration);
+    m_configMisc.kcfg_color_duration->setInputMask(inputMask);
     m_configMisc.kcfg_color_duration->setValidator(validator);
-    m_configMisc.kcfg_title_duration->setInputMask(pCore->timecode().mask());
+    m_configMisc.kcfg_title_duration->setInputMask(inputMask);
     m_configMisc.kcfg_title_duration->setValidator(validator);
-    m_configMisc.kcfg_transition_duration->setInputMask(pCore->timecode().mask());
+    m_configMisc.kcfg_transition_duration->setInputMask(inputMask);
     m_configMisc.kcfg_transition_duration->setValidator(validator);
-    m_configMisc.kcfg_mix_duration->setInputMask(pCore->timecode().mask());
+    m_configMisc.kcfg_mix_duration->setInputMask(inputMask);
     m_configMisc.kcfg_mix_duration->setValidator(validator);
-    m_configMisc.kcfg_image_duration->setInputMask(pCore->timecode().mask());
+    m_configMisc.kcfg_image_duration->setInputMask(inputMask);
     m_configMisc.kcfg_image_duration->setValidator(validator);
-    m_configMisc.kcfg_sequence_duration->setInputMask(pCore->timecode().mask());
+    m_configMisc.kcfg_sequence_duration->setInputMask(inputMask);
     m_configMisc.kcfg_sequence_duration->setValidator(validator);
-    m_configMisc.kcfg_fade_duration->setInputMask(pCore->timecode().mask());
+    m_configMisc.kcfg_fade_duration->setInputMask(inputMask);
     m_configMisc.kcfg_fade_duration->setValidator(validator);
-    m_configMisc.kcfg_subtitle_duration->setInputMask(pCore->timecode().mask());
+    m_configMisc.kcfg_subtitle_duration->setInputMask(inputMask);
     m_configMisc.kcfg_subtitle_duration->setValidator(validator);
 
     m_configMisc.preferredcomposite->clear();