diff --git a/src/libkirigami/platformtheme.cpp b/src/libkirigami/platformtheme.cpp
--- a/src/libkirigami/platformtheme.cpp
+++ b/src/libkirigami/platformtheme.cpp
@@ -129,6 +129,7 @@
 
 void PlatformThemePrivate::syncCustomPalette()
 {
+    const auto prev = customPalette;
     for (auto state : { QPalette::Active, QPalette::Inactive, QPalette::Disabled }) {
         setPaletteColor(customPalette, state, QPalette::WindowText, q->textColor());
         setPaletteColor(customPalette, state, QPalette::Window, q->backgroundColor());
@@ -143,7 +144,9 @@
         setPaletteColor(customPalette, state, QPalette::Link, q->linkColor());
         setPaletteColor(customPalette, state, QPalette::LinkVisited, q->visitedLinkColor());
     }
-    emit q->paletteChanged(customPalette);
+    if (prev != customPalette) {
+        emit q->paletteChanged(customPalette);
+    }
 }
 
 void PlatformThemePrivate::findParentStyle()