diff --git a/src/mesa/main/glformats.c b/src/mesa/main/glformats.c
index 6f74085d228..5efd55148f7 100644
--- a/src/mesa/main/glformats.c
+++ b/src/mesa/main/glformats.c
@@ -1223,6 +1223,10 @@ _mesa_is_stencil_format(GLenum format)
 {
    switch (format) {
       case GL_STENCIL_INDEX:
+      case GL_STENCIL_INDEX1:
+      case GL_STENCIL_INDEX4:
+      case GL_STENCIL_INDEX8:
+      case GL_STENCIL_INDEX16:
          return GL_TRUE;
       default:
          return GL_FALSE;