diff --git a/apps/openmw/mwmechanics/aibreathe.cpp b/apps/openmw/mwmechanics/aibreathe.cpp
index 2740355b57..94e4ecd955 100644
--- a/apps/openmw/mwmechanics/aibreathe.cpp
+++ b/apps/openmw/mwmechanics/aibreathe.cpp
@@ -23,7 +23,7 @@ bool MWMechanics::AiBreathe::execute (const MWWorld::Ptr& actor, CharacterContro
             actorClass.getCreatureStats(actor).setMovementFlag(CreatureStats::Flag_Run, true);
 
             actorClass.getMovementSettings(actor).mPosition[1] = 1;
-            smoothTurn(actor, -osg::PI / 2, 0);
+            smoothTurn(actor, static_cast<float>(-osg::PI_2), 0);
 
             return false;
         }
diff --git a/apps/openmw/mwrender/camera.cpp b/apps/openmw/mwrender/camera.cpp
index 12e6ef3ce9..3e5d1d0b31 100644
--- a/apps/openmw/mwrender/camera.cpp
+++ b/apps/openmw/mwrender/camera.cpp
@@ -433,7 +433,7 @@ namespace MWRender
     void Camera::setPitch(float angle)
     {
         const float epsilon = 0.000001f;
-        float limit = osg::PI_2 - epsilon;
+        float limit = static_cast<float>(osg::PI_2) - epsilon;
         mPitch = osg::clampBetween(angle, -limit, limit);
     }
 
diff --git a/components/sceneutil/pathgridutil.cpp b/components/sceneutil/pathgridutil.cpp
index ed6894dfc9..f37a8ba597 100644
--- a/components/sceneutil/pathgridutil.cpp
+++ b/components/sceneutil/pathgridutil.cpp
@@ -142,7 +142,7 @@ namespace SceneUtil
                 osg::Vec3f dir = toPos - fromPos;
                 dir.normalize();
 
-                osg::Quat rot = osg::Quat(-osg::PI / 2, osg::Vec3(0, 0, 1));
+                osg::Quat rot(static_cast<float>(-osg::PI_2), osg::Vec3f(0, 0, 1));
                 dir = rot * dir;
 
                 unsigned short diamondIndex = 0;