diff --git a/panda/src/pgui/pgFrameStyle.cxx b/panda/src/pgui/pgFrameStyle.cxx
index 0c36205748..7feb1f890c 100644
--- a/panda/src/pgui/pgFrameStyle.cxx
+++ b/panda/src/pgui/pgFrameStyle.cxx
@@ -192,11 +192,17 @@ generate_flat_geom(const LVecBase4f &frame) {
       ("PGFrame", format, qpGeomUsageHint::UH_static);
 
     qpGeomVertexWriter vertex(vdata, InternalName::get_vertex());
+    qpGeomVertexWriter color(vdata, InternalName::get_color());
     vertex.add_data3f(left, 0.0f, top);
     vertex.add_data3f(left, 0.0f, bottom);
     vertex.add_data3f(right, 0.0f, top);
     vertex.add_data3f(right, 0.0f, bottom);
 
+    color.add_data4f(_color);
+    color.add_data4f(_color);
+    color.add_data4f(_color);
+    color.add_data4f(_color);
+
     if (has_texture()) {
       // Generate UV's.
       left = uv_range[0];