diff --git a/panda/src/grutil/shaderTerrainMesh.cxx b/panda/src/grutil/shaderTerrainMesh.cxx
index a7f6b1d8af..8aac5f0e9a 100644
--- a/panda/src/grutil/shaderTerrainMesh.cxx
+++ b/panda/src/grutil/shaderTerrainMesh.cxx
@@ -150,6 +150,8 @@ void ShaderTerrainMesh::do_extract_heightfield() {
   }
   _heightfield_tex->set_minfilter(SamplerState::FT_linear);
   _heightfield_tex->set_magfilter(SamplerState::FT_linear);
+  _heightfield_tex->set_wrap_u(SamplerState::WM_clamp);
+  _heightfield_tex->set_wrap_v(SamplerState::WM_clamp);
 }
 
 /**