diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
index 9c2b4d2..660ab16 100644
--- a/src/mesa/state_tracker/st_manager.c
+++ b/src/mesa/state_tracker/st_manager.c
@@ -512,6 +512,9 @@ st_context_teximage(struct st_context_iface *stctxi,

       if (util_format_has_alpha(tex->format))
          internalFormat = GL_RGBA;
+      else if (util_format_get_component_bits(pipe_format,
+                 UTIL_FORMAT_COLORSPACE_RGB, 0) == 5)
+         internalFormat = GL_RGB5;
       else
          internalFormat = GL_RGB;