diff --git a/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp b/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp
index b85da958..bdcca277 100644
--- a/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp
+++ b/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp
@@ -3040,6 +3040,13 @@ void ScintillaEditView::setTabSettings(Lang *lang)
 {
     if (lang && lang->_tabSize != -1 && lang->_tabSize != 0)
     {
+		if (lang->_langID == L_JAVASCRIPT)
+		{
+			Lang *ljs = _pParameter->getLangFromID(L_JS);
+			execute(SCI_SETTABWIDTH, ljs->_tabSize);
+			execute(SCI_SETUSETABS, !ljs->_isTabReplacedBySpace);
+			return;
+		}
         execute(SCI_SETTABWIDTH, lang->_tabSize);
         execute(SCI_SETUSETABS, !lang->_isTabReplacedBySpace);
     }
diff --git a/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp b/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp
index 070ce59b..1f757971 100644
--- a/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp
+++ b/PowerEditor/src/WinControls/Preference/preferenceDlg.cpp
@@ -1811,6 +1811,17 @@ INT_PTR CALLBACK TabSettings::run_dlgProc(UINT Message, WPARAM wParam, LPARAM/*
                     {
                         Lang *lang = pNppParam->getLangFromIndex(index - 1);
                         if (!lang) return FALSE;
+						if (lang->_langID == L_JS)
+						{
+							Lang *ljs = pNppParam->getLangFromID(L_JAVASCRIPT);
+							ljs->_tabSize = size;
+						}
+						else if (lang->_langID == L_JAVASCRIPT)
+						{
+							Lang *ljavascript = pNppParam->getLangFromID(L_JS);
+							ljavascript->_tabSize = size;
+						}
+
                         lang->_tabSize = size;
 
                         // write in langs.xml
@@ -1836,6 +1847,18 @@ INT_PTR CALLBACK TabSettings::run_dlgProc(UINT Message, WPARAM wParam, LPARAM/*
                         if (!lang) return FALSE;
                         if (!lang->_tabSize || lang->_tabSize == -1)
                             lang->_tabSize = nppGUI._tabSize;
+
+						if (lang->_langID == L_JS)
+						{
+							Lang *ljs = pNppParam->getLangFromID(L_JAVASCRIPT);
+							ljs->_isTabReplacedBySpace = isTabReplacedBySpace;
+						}
+						else if (lang->_langID == L_JAVASCRIPT)
+						{
+							Lang *ljavascript = pNppParam->getLangFromID(L_JS);
+							ljavascript->_isTabReplacedBySpace = isTabReplacedBySpace;
+						}
+
                         lang->_isTabReplacedBySpace = isTabReplacedBySpace;
 
                         // write in langs.xml