1 files changed, 1 insertions, 1 deletions
diff --git a/build b/build
index 970464b5..46e4b270 100755
--- a/build
+++ b/build
@@ -90,7 +90,7 @@ older_than tangle/tangle tangle/*.cc && {
   noisy_cd ..  # no effect; just to show us returning to the parent directory
 }
 
-LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER  |grep -v '.mu$')
+LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER  |grep '.cc$')
 older_than mu.cc $LAYERS enumerate/enumerate tangle/tangle && {
   # no update here; rely on 'update' calls downstream
   ./tangle/tangle $LAYERS  > mu.cc