diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index ee16aefef7c..398eef1de83 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1157,6 +1157,7 @@ bool GLCanvas3D::init()
     glsafe(::glEnable(GL_BLEND));
     glsafe(::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
 
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
     // Set antialiasing / multisampling
     glsafe(::glDisable(GL_LINE_SMOOTH));
     glsafe(::glDisable(GL_POLYGON_SMOOTH));
@@ -1186,6 +1187,7 @@ bool GLCanvas3D::init()
     // A handy trick -- have surface material mirror the color.
     glsafe(::glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE));
     glsafe(::glEnable(GL_COLOR_MATERIAL));
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
 
     if (m_multisample_allowed)
         glsafe(::glEnable(GL_MULTISAMPLE));
@@ -5868,11 +5870,11 @@ void GLCanvas3D::_render_sla_slices()
         if (!bottom_obj_triangles.empty() || !top_obj_triangles.empty() || !bottom_sup_triangles.empty() || !top_sup_triangles.empty()) {
 			for (const SLAPrintObject::Instance& inst : obj->instances()) {
                 glsafe(::glPushMatrix());
-                glsafe(::glTranslated(unscale<double>(inst.shift.x()), unscale<double>(inst.shift.y()), 0));
-                glsafe(::glRotatef(Geometry::rad2deg(inst.rotation), 0.0, 0.0, 1.0));
+                glsafe(::glTranslated(unscale<double>(inst.shift.x()), unscale<double>(inst.shift.y()), 0.0));
+                glsafe(::glRotatef(Geometry::rad2deg(inst.rotation), 0.0f, 0.0f, 1.0f));
 				if (obj->is_left_handed())
                     // The polygons are mirrored by X.
-                    glsafe(::glScalef(-1.0, 1.0, 1.0));
+                    glsafe(::glScalef(-1.0f, 1.0f, 1.0f));
                 glsafe(::glEnableClientState(GL_VERTEX_ARRAY));
                 glsafe(::glColor3f(1.0f, 0.37f, 0.0f));
 				if (!bottom_obj_triangles.empty()) {