diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 5826d2d2192..bf46f51d7c0 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -409,6 +409,9 @@ is_legal_color_format(const struct gl_context *ctx, GLenum baseFormat)
    case GL_RGB:
    case GL_RGBA:
       return GL_TRUE;
+   case GL_LUMINANCE:
+   case GL_LUMINANCE_ALPHA:
+   case GL_INTENSITY:
    case GL_ALPHA:
       return ctx->Extensions.ARB_framebuffer_object;
    case GL_RED: