diff --git a/Detour/Source/DetourNavMeshQuery.cpp b/Detour/Source/DetourNavMeshQuery.cpp
index bdbee00..66d56ea 100644
--- a/Detour/Source/DetourNavMeshQuery.cpp
+++ b/Detour/Source/DetourNavMeshQuery.cpp
@@ -682,8 +682,8 @@ dtStatus dtNavMeshQuery::getPolyHeight(dtPolyRef ref, const float* pos, float* h
 	{
 		const float* v0 = &tile->verts[poly->verts[0]*3];
 		const float* v1 = &tile->verts[poly->verts[1]*3];
-		const float d0 = dtVdist(pos, v0);
-		const float d1 = dtVdist(pos, v1);
+		const float d0 = dtVdist2D(pos, v0);
+		const float d1 = dtVdist2D(pos, v1);
 		const float u = d0 / (d0+d1);
 		if (height)
 			*height = v0[1] + (v1[1] - v0[1]) * u;