diff --git a/pandatool/src/egg-palettize/textureProperties.cxx b/pandatool/src/egg-palettize/textureProperties.cxx
index 675c6cd5c1..99f1e6a9d1 100644
--- a/pandatool/src/egg-palettize/textureProperties.cxx
+++ b/pandatool/src/egg-palettize/textureProperties.cxx
@@ -112,6 +112,7 @@ bool TextureProperties::
 uses_alpha() const {
   switch (_format) {
   case EggTexture::F_rgba:
+  case EggTexture::F_rgbm:
   case EggTexture::F_rgba12:
   case EggTexture::F_rgba8:
   case EggTexture::F_rgba4: