diff --git a/xs/src/libslic3r/ClipperUtils.cpp b/xs/src/libslic3r/ClipperUtils.cpp
index 660b687e0..8aa72cae4 100644
--- a/xs/src/libslic3r/ClipperUtils.cpp
+++ b/xs/src/libslic3r/ClipperUtils.cpp
@@ -9,15 +9,6 @@
 
 #include <Shiny/Shiny.h>
 
-// Factor to convert from coord_t (which is int32) to an int64 type used by the Clipper library
-// for general offsetting (the offset(), offset2(), offset_ex() functions) and for the safety offset,
-// which is optionally executed by other functions (union, intersection, diff).
-// By the way, is the scalling for offset needed at all?
-#define CLIPPER_OFFSET_POWER_OF_2 17
-// 2^17=131072
-#define CLIPPER_OFFSET_SCALE (1 << CLIPPER_OFFSET_POWER_OF_2)
-#define CLIPPER_OFFSET_SCALE_ROUNDING_DELTA ((1 << (CLIPPER_OFFSET_POWER_OF_2 - 1)) - 1)
-
 namespace Slic3r {
 
 #ifdef CLIPPER_UTILS_DEBUG
diff --git a/xs/src/libslic3r/ClipperUtils.hpp b/xs/src/libslic3r/ClipperUtils.hpp
index d6060386a..b14232d90 100644
--- a/xs/src/libslic3r/ClipperUtils.hpp
+++ b/xs/src/libslic3r/ClipperUtils.hpp
@@ -12,6 +12,16 @@ using ClipperLib::jtMiter;
 using ClipperLib::jtRound;
 using ClipperLib::jtSquare;
 
+// Factor to convert from coord_t (which is int32) to an int64 type used by the Clipper library
+// for general offsetting (the offset(), offset2(), offset_ex() functions) and for the safety offset,
+// which is optionally executed by other functions (union, intersection, diff).
+// By the way, is the scalling for offset needed at all?
+#define CLIPPER_OFFSET_POWER_OF_2 17
+// 2^17=131072
+#define CLIPPER_OFFSET_SCALE (1 << CLIPPER_OFFSET_POWER_OF_2)
+#define CLIPPER_OFFSET_SCALE_ROUNDING_DELTA ((1 << (CLIPPER_OFFSET_POWER_OF_2 - 1)) - 1)
+#define CLIPPER_MAX_COORD_UNSCALED (ClipperLib::hiRange / CLIPPER_OFFSET_SCALE)
+
 namespace Slic3r {
 
 //-----------------------------------------------------------
diff --git a/xs/src/libslic3r/Geometry.cpp b/xs/src/libslic3r/Geometry.cpp
index 314990734..96613549a 100644
--- a/xs/src/libslic3r/Geometry.cpp
+++ b/xs/src/libslic3r/Geometry.cpp
@@ -983,6 +983,13 @@ MedialAxis::process_edge_neighbors(const VD::edge_type* edge, ThickPolyline* pol
 bool
 MedialAxis::validate_edge(const VD::edge_type* edge)
 {
+    // prevent overflows and detect almost-infinite edges
+    if (std::abs(edge->vertex0()->x()) > double(CLIPPER_MAX_COORD_UNSCALED) || 
+        std::abs(edge->vertex0()->y()) > double(CLIPPER_MAX_COORD_UNSCALED) || 
+        std::abs(edge->vertex1()->x()) > double(CLIPPER_MAX_COORD_UNSCALED) ||
+        std::abs(edge->vertex1()->y()) > double(CLIPPER_MAX_COORD_UNSCALED))
+        return false;
+
     // construct the line representing this edge of the Voronoi diagram
     const Line line(
         Point( edge->vertex0()->x(), edge->vertex0()->y() ),