diff --git a/src/slic3r/GUI/Camera.cpp b/src/slic3r/GUI/Camera.cpp
index a01e76ea4c..8271a81bab 100644
--- a/src/slic3r/GUI/Camera.cpp
+++ b/src/slic3r/GUI/Camera.cpp
@@ -103,13 +103,13 @@ double Camera::get_fov() const
     };
 }
 
-void Camera::apply_viewport(int x, int y, unsigned int w, unsigned int h) const
+void Camera::apply_viewport(int x, int y, unsigned int w, unsigned int h)
 {
     glsafe(::glViewport(0, 0, w, h));
-    glsafe(::glGetIntegerv(GL_VIEWPORT, const_cast<std::array<int, 4>*>(&m_viewport)->data()));
+    glsafe(::glGetIntegerv(GL_VIEWPORT, m_viewport.data()));
 }
 
-void Camera::apply_view_matrix() const
+void Camera::apply_view_matrix()
 {
     glsafe(::glMatrixMode(GL_MODELVIEW));
     glsafe(::glLoadIdentity());
diff --git a/src/slic3r/GUI/Camera.hpp b/src/slic3r/GUI/Camera.hpp
index 7fbe1d55c7..1788ab5458 100644
--- a/src/slic3r/GUI/Camera.hpp
+++ b/src/slic3r/GUI/Camera.hpp
@@ -91,8 +91,8 @@ public:
 
     double get_fov() const;
 
-    void apply_viewport(int x, int y, unsigned int w, unsigned int h) const;
-    void apply_view_matrix() const;
+    void apply_viewport(int x, int y, unsigned int w, unsigned int h);
+    void apply_view_matrix();
     // Calculates and applies the projection matrix tighting the frustrum z range around the given box.
     // If larger z span is needed, pass the desired values of near and far z (negative values are ignored)
     void apply_projection(const BoundingBoxf3& box, double near_z = -1.0, double far_z = -1.0);
@@ -105,7 +105,7 @@ public:
 #endif // ENABLE_CAMERA_STATISTICS
 
     // translate the camera in world space
-    void translate_world(const Vec3d& displacement) { this->set_target(m_target + displacement); }
+    void translate_world(const Vec3d& displacement) { set_target(m_target + displacement); }
 
     // rotate the camera on a sphere having center == m_target and radius == m_distance
     // using the given variations of spherical coordinates