diff --git a/Source/Engine/Terrain/TerrainPatch.cpp b/Source/Engine/Terrain/TerrainPatch.cpp
index e579c05f7..164fce747 100644
--- a/Source/Engine/Terrain/TerrainPatch.cpp
+++ b/Source/Engine/Terrain/TerrainPatch.cpp
@@ -2572,9 +2572,9 @@ void TerrainPatch::ExtractCollisionGeometry(Array<Float3>& vertexBuffer, Array<i
             const int32 vertexCount = rows * cols;
             _collisionVertices.Resize(vertexCount);
             Float3* vb = _collisionVertices.Get();
-            for (int32 row = 0; row < rows; row++)
+            for (int32 col = 0; col < cols; col++)
             {
-                for (int32 col = 0; col < cols; col++)
+                for (int32 row = 0; row < rows; row++)
                 {
                     Float3 v((float)row, PhysicsBackend::GetHeightFieldHeight(_physicsHeightField, row, col) / TERRAIN_PATCH_COLLISION_QUANTIZATION, (float)col);
                     Float3::Transform(v, world, v);
@@ -2591,9 +2591,9 @@ void TerrainPatch::ExtractCollisionGeometry(Array<Float3>& vertexBuffer, Array<i
     const int32 indexCount = (rows - 1) * (cols - 1) * 6;
     indexBuffer.Resize(indexCount);
     int32* ib = indexBuffer.Get();
-    for (int32 row = 0; row < rows - 1; row++)
+    for (int32 col = 0; col < cols - 1; col++)
     {
-        for (int32 col = 0; col < cols - 1; col++)
+        for (int32 row = 0; row < rows - 1; row++)
         {
 #define GET_INDEX(x, y) *ib++ = (col + (y)) + (row + (x)) * cols