diff --git a/src/libs/modelinglib/qmt/diagram_scene/parts/arrowitem.cpp b/src/libs/modelinglib/qmt/diagram_scene/parts/arrowitem.cpp
index 3dddd5fbb4c..afd676b0f05 100644
--- a/src/libs/modelinglib/qmt/diagram_scene/parts/arrowitem.cpp
+++ b/src/libs/modelinglib/qmt/diagram_scene/parts/arrowitem.cpp
@@ -454,7 +454,7 @@ void ArrowItem::updateHeadGeometry(QGraphicsItem *headItem, const QPointF &pos,
 
     QVector2D directionVector(pos - otherPos);
     directionVector.normalize();
-    double angle = qAcos(directionVector.x()) * 180.0 / 3.1415926535;
+    double angle = qAcos(directionVector.x()) * 180.0 / M_PI;
     if (directionVector.y() > 0.0)
         angle = -angle;
     headItem->setRotation(-angle);
diff --git a/src/libs/modelinglib/qmt/infrastructure/geometryutilities.cpp b/src/libs/modelinglib/qmt/infrastructure/geometryutilities.cpp
index 2e140731a92..461897ee75d 100644
--- a/src/libs/modelinglib/qmt/infrastructure/geometryutilities.cpp
+++ b/src/libs/modelinglib/qmt/infrastructure/geometryutilities.cpp
@@ -219,7 +219,7 @@ double GeometryUtilities::calcAngle(const QLineF &line)
 {
     QVector2D directionVector(line.p2() - line.p1());
     directionVector.normalize();
-    double angle = qAcos(directionVector.x()) * 180.0 / 3.1415926535;
+    double angle = qAcos(directionVector.x()) * 180.0 / M_PI;
     if (directionVector.y() > 0.0)
         angle = -angle;
     return angle;
diff --git a/src/plugins/coreplugin/progressmanager/progressmanager.cpp b/src/plugins/coreplugin/progressmanager/progressmanager.cpp
index 1800d562946..9891a2b3f40 100644
--- a/src/plugins/coreplugin/progressmanager/progressmanager.cpp
+++ b/src/plugins/coreplugin/progressmanager/progressmanager.cpp
@@ -8,7 +8,6 @@
 #include "../actionmanager/actionmanager.h"
 #include "../actionmanager/command.h"
 #include "../icontext.h"
-#include "../coreconstants.h"
 #include "../icore.h"
 #include "../statusbarmanager.h"
 
@@ -28,10 +27,9 @@
 #include <QStyle>
 #include <QStyleOption>
 #include <QTimer>
+#include <QtMath>
 #include <QVariant>
 
-#include <math.h>
-
 static const char kSettingsGroup[] = "Progress";
 static const char kDetailsPinned[] = "DetailsPinned";
 static const bool kDetailsPinnedDefault = true;
@@ -787,7 +785,7 @@ void ProgressTimer::handleTimeout()
     // future finishes. That's not bad for a random choice.
     const double mapped = atan2(double(m_currentTime) * TimerInterval / 1000.0,
                                 double(m_expectedTime));
-    const double progress = 100 * 2 * mapped / 3.14;
+    const double progress = 100 * 2 * mapped / M_PI;
     m_futureInterface.setProgressValue(int(progress));
 }