diff --git a/pcbnew/class_drawsegment.h b/pcbnew/class_drawsegment.h
index 0e3b273ba8..60e87fbe93 100644
--- a/pcbnew/class_drawsegment.h
+++ b/pcbnew/class_drawsegment.h
@@ -149,7 +149,9 @@ public:
     int GetRadius() const
     {
         double radius = GetLineLength( m_Start, m_End );
-        return KiROUND( radius );
+
+        // don't allow degenerate arcs
+        return std::max( 1, KiROUND( radius ) );
     }
 
     /**