diff --git a/sidebar/ToolTips/tooltipmanager.cpp b/sidebar/ToolTips/tooltipmanager.cpp
--- a/sidebar/ToolTips/tooltipmanager.cpp
+++ b/sidebar/ToolTips/tooltipmanager.cpp
@@ -145,7 +145,13 @@
 QWidget * ToolTipManager::createTipContent( QModelIndex item )
 {
     const QSize dialogIconSize = QSize(IconSize(KIconLoader::Dialog), IconSize(KIconLoader::Dialog));
-    const QSize toolbarIconSize = QSize(IconSize(KIconLoader::MainToolbar), IconSize(KIconLoader::MainToolbar));
+    // We don't use KIconLoader::MainToolbar for this because its default size
+    // is 22x22, but some color icons have monochrome 22x22 versions, and those
+    // would be displayed. But we always want to display downscaled color icons
+    // instead of monochrome icons, so we hardcode 24x24, at which size none of
+    // the color icons have monochrome versions. See also
+    // https://bugs.kde.org/show_bug.cgi?id=386748
+    const QSize toolbarIconSize = QSize(24, 24);
 
     QWidget * tipContent = new QWidget();
     QGridLayout* tipLayout = new QGridLayout();