diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index d7d4f0799..94cf4dbed 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -2491,6 +2491,7 @@ ExPolygons PrintObject::_smooth_curves(const ExPolygons & input, const PrintRegi
         }
         return new_polys;
     }
+    return ExPolygons();
 }
 
 // To be used only if there are no layer span specific configurations applied, which would lead to z ranges being generated for this region.