diff --git a/src/DotRecast.Detour/DtNavMeshQuery.cs b/src/DotRecast.Detour/DtNavMeshQuery.cs
index ee0e699..9defb66 100644
--- a/src/DotRecast.Detour/DtNavMeshQuery.cs
+++ b/src/DotRecast.Detour/DtNavMeshQuery.cs
@@ -2523,7 +2523,7 @@ namespace DotRecast.Detour
                     // int va = a * 3;
                     // int vb = b * 3;
                     float dx = verts[b].X - verts[a].X;
-                    float dz = verts[b].Z - verts[a].X;
+                    float dz = verts[b].Z - verts[a].Z;
                     hit.hitNormal = RcVec3f.Normalize(new RcVec3f(dz, 0, -dx));
                     return DtStatus.DT_SUCCESS;
                 }