diff --git a/toonz/sources/toonz/xsheetcmd.cpp b/toonz/sources/toonz/xsheetcmd.cpp
index 7f29ef7..8308f3a 100644
--- a/toonz/sources/toonz/xsheetcmd.cpp
+++ b/toonz/sources/toonz/xsheetcmd.cpp
@@ -361,14 +361,9 @@ void GlobalKeyframeUndo::doInsertGlobalKeyframes(
     int frame, const std::vector<int> &columns) {
   TXsheet *xsh = TApp::instance()->getCurrentXsheet()->getXsheet();
 
-  int i, colsCount = columns.size();
-  int startCol =
-      Preferences::instance()->isXsheetCameraColumnVisible() ? -1 : 0;
-  for (i = startCol; i != colsCount; ++i) {
+  for (const int c : columns) {
     TStageObjectId objectId;
 
-    int c = columns[i];
-
     TXshColumn *column = xsh->getColumn(c);
     if (column && column->getSoundColumn()) continue;
 
@@ -393,14 +388,9 @@ void GlobalKeyframeUndo::doRemoveGlobalKeyframes(
     int frame, const std::vector<int> &columns) {
   TXsheet *xsh = TApp::instance()->getCurrentXsheet()->getXsheet();
 
-  int i, colsCount = columns.size();
-  int startCol =
-      Preferences::instance()->isXsheetCameraColumnVisible() ? -1 : 0;
-  for (i = 0; i != colsCount; ++i) {
+  for (const int c : columns) {
     TStageObjectId objectId;
 
-    int c = columns[i];
-
     TXshColumn *column = xsh->getColumn(c);
     if (column && column->getSoundColumn()) continue;