diff --git a/src/categoryselectwidget.cpp b/src/categoryselectwidget.cpp
--- a/src/categoryselectwidget.cpp
+++ b/src/categoryselectwidget.cpp
@@ -84,7 +84,7 @@
 
     QHBoxLayout *hbox = new QHBoxLayout(q);
     hbox->setSpacing(0);
-    hbox->setMargin(0);
+    hbox->setContentsMargins(0, 0, 0, 0);
 
     checkCombo = new KPIM::KCheckComboBox;
     checkCombo->setMinimumWidth(150);
diff --git a/src/configuration/kaddressbook_config_plugins.cpp b/src/configuration/kaddressbook_config_plugins.cpp
--- a/src/configuration/kaddressbook_config_plugins.cpp
+++ b/src/configuration/kaddressbook_config_plugins.cpp
@@ -35,7 +35,7 @@
     : KCModule(parent, args)
 {
     QHBoxLayout *lay = new QHBoxLayout(this);
-    lay->setMargin(0);
+    lay->setContentsMargins(0, 0, 0, 0);
 
     KAboutData *about = new KAboutData(QStringLiteral("kcmakrpluginsconfig"),
                                        i18n("Configure Plugins"),
diff --git a/src/kaddressbookpart.cpp b/src/kaddressbookpart.cpp
--- a/src/kaddressbookpart.cpp
+++ b/src/kaddressbookpart.cpp
@@ -54,7 +54,7 @@
     initAction();
 
     topLayout->addWidget(mMainWidget);
-    topLayout->setMargin(0);
+    topLayout->setContentsMargins(0, 0, 0, 0);
     setXMLFile(QStringLiteral("kaddressbookui.rc"));
 }
 
diff --git a/src/mainwidget.cpp b/src/mainwidget.cpp
--- a/src/mainwidget.cpp
+++ b/src/mainwidget.cpp
@@ -511,7 +511,7 @@
 {
     // the horizontal main layout
     QHBoxLayout *layout = new QHBoxLayout(this);
-    layout->setMargin(0);
+    layout->setContentsMargins(0, 0, 0, 0);
 
     // Splitter 1 contains the two main parts of the GUI:
     //  - collection and item view splitter 2 on the left (see below)
@@ -552,7 +552,7 @@
     mMainWidgetSplitter1->setChildrenCollapsible(false);
 
     QVBoxLayout *detailsPaneLayout = new QVBoxLayout(mDetailsPane);
-    detailsPaneLayout->setMargin(0);
+    detailsPaneLayout->setContentsMargins(0, 0, 0, 0);
 
     // the details view stack
     mDetailsViewStack = new QStackedWidget();
diff --git a/src/widgets/quicksearchwidget.cpp b/src/widgets/quicksearchwidget.cpp
--- a/src/widgets/quicksearchwidget.cpp
+++ b/src/widgets/quicksearchwidget.cpp
@@ -32,7 +32,7 @@
     : QWidget(parent)
 {
     QVBoxLayout *layout = new QVBoxLayout(this);
-    layout->setMargin(0);
+    layout->setContentsMargins(0, 0, 0, 0);
 
     mEdit = new QLineEdit(this);
     //If change shortcut changes it in mainwidget