diff --git a/src/libslic3r/BoundingBox.hpp b/src/libslic3r/BoundingBox.hpp
index 42f5220975..8aac3f1cb9 100644
--- a/src/libslic3r/BoundingBox.hpp
+++ b/src/libslic3r/BoundingBox.hpp
@@ -25,7 +25,7 @@ public:
         min(p1), max(p1), defined(false) { merge(p2); merge(p3); }
 
     template<class It, class = IteratorOnly<It>>
-    BoundingBoxBase(It from, It to)
+    BoundingBoxBase(It from, It to) : BoundingBoxBase()
         { construct(*this, from, to); }
 
     BoundingBoxBase(const PointsType &points)
diff --git a/src/libslic3r/Fill/FillBase.cpp b/src/libslic3r/Fill/FillBase.cpp
index 2606529099..45157ec42d 100644
--- a/src/libslic3r/Fill/FillBase.cpp
+++ b/src/libslic3r/Fill/FillBase.cpp
@@ -1857,12 +1857,12 @@ static inline void base_support_extend_infill_lines(Polylines &infill, BoundaryI
         const bool                   first           = graph.first(cp);
         int                          extend_next_idx = -1;
         int                          extend_prev_idx = -1;
-        coord_t                      dist_y_prev;
-        coord_t                      dist_y_next;
-        double                       arc_len_prev;
-        double                       arc_len_next;
+        coord_t                      dist_y_prev     = 0;
+        coord_t                      dist_y_next     = 0;
+        double                       arc_len_prev    = 0;
+        double                       arc_len_next    = 0;
 
-        if (! graph.next_vertical(cp)){
+        if (! graph.next_vertical(cp)) {
             size_t i = cp.point_idx;
             size_t j = next_idx_modulo(i, contour);
             while (j != cp.next_on_contour->point_idx) {