diff --git a/src/slic3r/GUI/3DScene.cpp b/src/slic3r/GUI/3DScene.cpp
index db588574a7..d58c81cf8c 100644
--- a/src/slic3r/GUI/3DScene.cpp
+++ b/src/slic3r/GUI/3DScene.cpp
@@ -508,7 +508,7 @@ int GLVolumeCollection::load_wipe_tower_preview(
 
     // Because the GLVolume is also used for arrangement, it must be safely larger
     // than the actual extruded tower, otherwise the arranged tower ends up out of bed.
-    float offset = 0.3;
+    const float offset = 0.3f;
     pos_x -= offset;
     pos_y -= offset;
     width += 2.f * offset;