diff --git a/src/libslic3r/Config.hpp b/src/libslic3r/Config.hpp
index ef3dc32c81..a0425bfee4 100644
--- a/src/libslic3r/Config.hpp
+++ b/src/libslic3r/Config.hpp
@@ -1793,7 +1793,7 @@ public:
         enum_values.reserve(il.size());
         enum_labels.clear();
         enum_labels.reserve(il.size());
-        for (const std::pair<std::string_view, std::string_view> p : il) {
+        for (const std::pair<std::string_view, std::string_view> &p : il) {
             enum_values.emplace_back(p.first);
             enum_labels.emplace_back(p.second);
         }
diff --git a/src/libslic3r/Point.cpp b/src/libslic3r/Point.cpp
index 794b27c444..09afcc3993 100644
--- a/src/libslic3r/Point.cpp
+++ b/src/libslic3r/Point.cpp
@@ -94,6 +94,19 @@ BoundingBox get_extents(const Points &pts)
 template BoundingBox get_extents<false>(const Points &pts);
 template BoundingBox get_extents<true>(const Points &pts);
 
+// if IncludeBoundary, then a bounding box is defined even for a single point.
+// otherwise a bounding box is only defined if it has a positive area.
+template<bool IncludeBoundary>
+BoundingBox get_extents(const std::vector<Points> &pts)
+{
+    BoundingBox bbox;
+    for (const Points &p : pts)
+        bbox.merge(get_extents<IncludeBoundary>(p));
+    return bbox;
+}
+template BoundingBox get_extents<false>(const std::vector<Points> &pts);
+template BoundingBox get_extents<true>(const std::vector<Points> &pts);
+
 BoundingBoxf get_extents(const std::vector<Vec2d> &pts)
 {
     BoundingBoxf bbox;
diff --git a/src/libslic3r/Point.hpp b/src/libslic3r/Point.hpp
index 389fa313b5..e86cdcceda 100644
--- a/src/libslic3r/Point.hpp
+++ b/src/libslic3r/Point.hpp
@@ -233,19 +233,15 @@ inline Point lerp(const Point &a, const Point &b, double t)
 // otherwise a bounding box is only defined if it has a positive area.
 template<bool IncludeBoundary = false>
 BoundingBox get_extents(const Points &pts);
-extern template BoundingBox get_extents<false>(const Points& pts);
-extern template BoundingBox get_extents<true>(const Points& pts);
+extern template BoundingBox get_extents<false>(const Points &pts);
+extern template BoundingBox get_extents<true>(const Points &pts);
 
 // if IncludeBoundary, then a bounding box is defined even for a single point.
 // otherwise a bounding box is only defined if it has a positive area.
 template<bool IncludeBoundary = false>
-BoundingBox get_extents(const std::vector<Points> &pts)
-{
-    BoundingBox bbox;
-    for (const Points &p : pts)
-        bbox.merge(get_extents<IncludeBoundary>(p));
-    return bbox;
-}
+BoundingBox get_extents(const std::vector<Points> &pts);
+extern template BoundingBox get_extents<false>(const std::vector<Points> &pts);
+extern template BoundingBox get_extents<true>(const std::vector<Points> &pts);
 
 BoundingBoxf get_extents(const std::vector<Vec2d> &pts);