diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index e4fdd847dc..f1c25d79d1 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -346,7 +346,7 @@ std::string GLCanvas3D::LayersEditing::get_tooltip(const GLCanvas3D& canvas) con
                 }
             }
             if (h > 0.0f)
-                ret = std::to_string(h);
+                ret = format("%.3f", h);
         }
     }
     return ret;