diff --git a/floorplan/v2/FloorplanCeilings.h b/floorplan/v2/FloorplanCeilings.h
index 857bfe8..658e64a 100644
--- a/floorplan/v2/FloorplanCeilings.h
+++ b/floorplan/v2/FloorplanCeilings.h
@@ -80,8 +80,8 @@ namespace Floorplan {
 
 	#ifdef WITH_ASSERTIONS
 
-			static int numNear = 0;
-			static int numFar = 0;
+            static uint64_t numNear = 0;
+            static uint64_t numFar = 0;
 			for (const float z : ceilingsAtHeight_m) {
 				const float diff = std::min( std::abs(z-zMin), std::abs(z-zMax) );
 				if (diff < 0.1) {++numNear;} else {++numFar;}