diff --git a/src/celengine/render.cpp b/src/celengine/render.cpp
index d986e9a2..45d4f15d 100644
--- a/src/celengine/render.cpp
+++ b/src/celengine/render.cpp
@@ -6638,7 +6638,7 @@ static void drawRectangle(const Renderer &renderer, const Rect &r)
     array<float, 8> vertices = { r.x, r.y,  r.x+r.w, r.y, r.x+r.w, r.y+r.h, r.x, r.y+r.h };
 
     auto s = static_cast<GLsizeiptr>(memsize(vertices) + memsize(texels) + 4*4*sizeof(GLfloat));
-    static celgl::VertexObject vo{ GL_ARRAY_BUFFER, s, GL_DYNAMIC_DRAW };
+    static celgl::VertexObject vo{ GL_ARRAY_BUFFER, s, GL_STREAM_DRAW };
     vo.bindWritable();
 
     if (!vo.initialized())
diff --git a/src/celengine/visibleregion.cpp b/src/celengine/visibleregion.cpp
index 01e7f4fd..4ec1fb7f 100644
--- a/src/celengine/visibleregion.cpp
+++ b/src/celengine/visibleregion.cpp
@@ -92,7 +92,7 @@ renderTerminator(Renderer* renderer, const vector<Vector3f>& pos, const Vector4f
      * Because of this we make calculations on a CPU and stream results to GPU.
      */
 
-    static celgl::VertexObject vo{ GL_ARRAY_BUFFER, maxSections * sizeof(Vector3f), GL_DYNAMIC_DRAW };
+    static celgl::VertexObject vo{ GL_ARRAY_BUFFER, maxSections * sizeof(Vector3f), GL_STREAM_DRAW };
 
     auto *prog = renderer->getShaderManager().getShader("uniform_color");
     if (prog == nullptr)