diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@
 
 project(ksirk VERSION ${KDE_APPLICATIONS_VERSION})
 
-set (QT_MIN_VERSION "5.7.0")
+set (QT_MIN_VERSION "5.8.0")
 set (KF5_MIN_VERSION "5.30.0")
 
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED CONFIG)
diff --git a/ksirk/GameLogic/gameautomaton.cpp b/ksirk/GameLogic/gameautomaton.cpp
--- a/ksirk/GameLogic/gameautomaton.cpp
+++ b/ksirk/GameLogic/gameautomaton.cpp
@@ -2198,6 +2198,7 @@
   case DecrNbArmies:
     stream >> countryName >> nbArmies;
     m_game->theWorld()->countryNamed(countryName)->decrNbArmies(nbArmies);
+    Q_FALLTHROUGH();
   case StartLocalCurrentAI:
     m_game->startLocalCurrentAI();
     break;
diff --git a/ksirk/GameLogic/goal.h b/ksirk/GameLogic/goal.h
--- a/ksirk/GameLogic/goal.h
+++ b/ksirk/GameLogic/goal.h
@@ -68,7 +68,7 @@
   
   /** Default destructor */
   ~Goal();
-
+  
   //@{
   /** Accessors for the goal type */
   inline GoalType type() const {return m_type;}
diff --git a/ksirk/krightdialog.cpp b/ksirk/krightdialog.cpp
--- a/ksirk/krightdialog.cpp
+++ b/ksirk/krightdialog.cpp
@@ -443,31 +443,31 @@
   QHBoxLayout * deAtt = new QHBoxLayout();
   QHBoxLayout * deDef = new QHBoxLayout();
 
-  if(A1!=0 || A1!=-1)
+  if(A1!=0 && A1!=-1)
   {
     QLabel * de1 = new QLabel();
     de1->setPixmap(game->getDice(KGameWindow::Red,A1));
     rightContents.insert(0,de1);deAtt->addWidget(de1);
   }
-  if(A2!=0 || A2!=-1)
+  if(A2!=0 && A2!=-1)
   {
     QLabel * de2= new QLabel();
     de2->setPixmap(game->getDice(KGameWindow::Red,A2));
     rightContents.insert(0,de2);deAtt->addWidget(de2);
   }
-  if(A3!=0 || A3!=-1)
+  if(A3!=0 && A3!=-1)
   {
     QLabel * de3= new QLabel();
     de3->setPixmap(game->getDice(KGameWindow::Red,A3));
     rightContents.insert(0,de3);deAtt->addWidget(de3);
   }
-  if(D1!=0 || D1!=-1)
+  if(D1!=0 && D1!=-1)
   {
     QLabel * de4= new QLabel();
     de4->setPixmap(game->getDice(KGameWindow::Blue,D1));
     rightContents.insert(0,de4);deDef->addWidget(de4);
   }
-  if(D2!=0 || D2!=-1)
+  if(D2!=0 && D2!=-1)
   {
     QLabel * de5= new QLabel();
     de5->setPixmap(game->getDice(KGameWindow::Blue,D2));
diff --git a/ksirkskineditor/onu.cpp b/ksirkskineditor/onu.cpp
--- a/ksirkskineditor/onu.cpp
+++ b/ksirkskineditor/onu.cpp
@@ -778,7 +778,7 @@
 void ONU::setFont(const QFont& font)
 {
   if (m_font.family == font.family()
-      && m_font.size == font.pointSize()
+      && (int)m_font.size == font.pointSize()
       && m_font.weight == (QFont::Weight)font.weight()
       && m_font.italic == font.italic())
     return;