diff --git a/.travis.yml b/.travis.yml
index 88f2863..5d3b3b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -31,11 +31,13 @@ env:
     - ARCH="aarch64" SRC="biscuit"
 
 
-# no musl gcc
 allow_failures:
   matrix:
+    # no musl gcc
     - ARCH="x86_64" SRC="biscuit"
     - ARCH="aarch64" SRC="biscuit"
+    # too slow or homebrew too old
+    - os: osx
 
 install:
   - if [ $ARCH = riscv32 ] || [ $ARCH = riscv64 ]; then