diff --git a/pcbnew/footprint.cpp b/pcbnew/footprint.cpp
index c96917bb94..70d92f1041 100644
--- a/pcbnew/footprint.cpp
+++ b/pcbnew/footprint.cpp
@@ -2515,6 +2515,8 @@ double FOOTPRINT::CoverageRatio( const GENERAL_COLLECTOR& aCollector ) const
         }
     }
 
+    coveredRegion.BooleanIntersection( footprintRegion, SHAPE_POLY_SET::PM_FAST );
+
     double footprintRegionArea = polygonArea( footprintRegion );
     double uncoveredRegionArea = footprintRegionArea - polygonArea( coveredRegion );
     double coveredArea = footprintRegionArea - uncoveredRegionArea;