diff --git a/effects/coverswitch/coverswitch.cpp b/effects/coverswitch/coverswitch.cpp
index 022a494c85..fa6ec84a3f 100644
--- a/effects/coverswitch/coverswitch.cpp
+++ b/effects/coverswitch/coverswitch.cpp
@@ -32,7 +32,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <kwinglutils.h>
 #include <kwinglplatform.h>
 
-#include <math.h>
+#include <cmath>
 
 namespace KWin
 {
diff --git a/effects/flipswitch/flipswitch.cpp b/effects/flipswitch/flipswitch.cpp
index fd39b5032e..f429b05806 100644
--- a/effects/flipswitch/flipswitch.cpp
+++ b/effects/flipswitch/flipswitch.cpp
@@ -33,7 +33,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <kwinglutils.h>
 
-#include <math.h>
+#include <cmath>
 
 namespace KWin
 {