diff --git a/.github/workflows/GNU.yml b/.github/workflows/GNU.yml
index 4d3e39613..2cfc535ce 100644
--- a/.github/workflows/GNU.yml
+++ b/.github/workflows/GNU.yml
@@ -104,7 +104,7 @@ jobs:
         GNULIB_DIR="${PWD}/gnulib"
         pushd gnu
 
-        timeout -sKILL 4h make -j "$(nproc)" check SUBDIRS=. RUN_EXPENSIVE_TESTS=yes RUN_VERY_EXPENSIVE_TESTS=yes VERBOSE=no || : # Kill after 4 hours in case something gets stuck in make
+        unbuffer timeout -sKILL 4h make -j "$(nproc)" check SUBDIRS=. RUN_EXPENSIVE_TESTS=yes RUN_VERY_EXPENSIVE_TESTS=yes VERBOSE=no || : # Kill after 4 hours in case something gets stuck in make
     - name: Extract tests info
       shell: bash
       run: |