diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 19bad75b20e..decd67147e5 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -5728,6 +5728,7 @@ compressed_tex_sub_image(unsigned dim, GLenum target, GLuint textureOrIndex,
          break;
       case TEX_MODE_CURRENT_NO_ERROR:
          no_error = true;
+         /* fallthrough */
       case TEX_MODE_CURRENT_ERROR:
       default:
          assert(textureOrIndex == 0);