diff --git a/src/DotRecast.Detour/DtNavMeshQuery.cs b/src/DotRecast.Detour/DtNavMeshQuery.cs
index d0454d1..685c722 100644
--- a/src/DotRecast.Detour/DtNavMeshQuery.cs
+++ b/src/DotRecast.Detour/DtNavMeshQuery.cs
@@ -2621,12 +2621,12 @@ namespace DotRecast.Detour
         ///  @param[in]		maxResult		The maximum number of polygons the result arrays can hold.
         /// @returns The status flags for the query.
         public DtStatus FindPolysAroundShape(long startRef, float[] verts, IDtQueryFilter filter,
-            out List<long> resultRef, out List<long> resultParent, out List<float> resultCost)
+            ref List<long> resultRef, ref List<long> resultParent, ref List<float> resultCost)
         {
-            resultRef = new List<long>();
-            resultParent = new List<long>();
-            resultCost = new List<float>();
-
+            resultRef.Clear();
+            resultParent.Clear();
+            resultCost.Clear();
+            
             // Validate input
             int nverts = verts.Length / 3;
             if (!m_nav.IsValidPolyRef(startRef) || null == verts || nverts < 3 || null == filter)
diff --git a/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs b/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs
index 3603adb..b60760b 100644
--- a/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/TestNavmeshTool.cs
@@ -453,7 +453,11 @@ public class TestNavmeshTool : IRcTool
                 m_queryPoly[10] = m_epos.y + agentHeight / 2;
                 m_queryPoly[11] = m_epos.z + nz;
 
-                var status = m_navQuery.FindPolysAroundShape(m_startRef, m_queryPoly, m_filter, out var refs, out var parentRefs, out var costs);
+                var refs = new List<long>();
+                var parentRefs = new List<long>();
+                var costs = new List<float>();
+
+                var status = m_navQuery.FindPolysAroundShape(m_startRef, m_queryPoly, m_filter, ref refs, ref parentRefs, ref costs);
                 if (status.Succeeded())
                 {
                     m_polys = refs;
diff --git a/test/DotRecast.Detour.Test/FindPolysAroundShapeTest.cs b/test/DotRecast.Detour.Test/FindPolysAroundShapeTest.cs
index 0834521..8935105 100644
--- a/test/DotRecast.Detour.Test/FindPolysAroundShapeTest.cs
+++ b/test/DotRecast.Detour.Test/FindPolysAroundShapeTest.cs
@@ -16,8 +16,8 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 */
 
+using System.Collections.Generic;
 using DotRecast.Core;
-
 using NUnit.Framework;
 
 namespace DotRecast.Detour.Test;
@@ -129,11 +129,16 @@ public class FindPolysAroundShapeTest : AbstractDetourTest
     public void TestFindPolysAroundShape()
     {
         IDtQueryFilter filter = new DtQueryDefaultFilter();
+        var refs = new List<long>();
+        var parentRefs = new List<long>();
+        var costs = new List<float>();
+
         for (int i = 0; i < startRefs.Length; i++)
         {
             long startRef = startRefs[i];
             RcVec3f startPos = startPoss[i];
-            query.FindPolysAroundShape(startRef, GetQueryPoly(startPos, endPoss[i]), filter, out var refs, out var parentRefs, out var costs);
+            query.FindPolysAroundShape(startRef, GetQueryPoly(startPos, endPoss[i]), filter, ref refs, ref parentRefs, ref costs);
+
             Assert.That(refs.Count, Is.EqualTo(REFS[i].Length));
             for (int v = 0; v < REFS[i].Length; v++)
             {