diff --git a/util/run-gnu-test.sh b/util/run-gnu-test.sh
index 9f8cc1923..4ff266833 100755
--- a/util/run-gnu-test.sh
+++ b/util/run-gnu-test.sh
@@ -37,4 +37,4 @@ fi
 # * `gl_public_submodule_commit=` disables testing for use of a "public" gnulib commit (which will fail when using shallow gnulib checkouts)
 # * `srcdir=..` specifies the GNU source directory for tests (fixing failing/confused 'tests/factor/tNN.sh' tests and causing no harm to other tests)
 #shellcheck disable=SC2086
-timeout -sKILL 2h make -j "$(nproc)" check ${RUN_TEST} SUBDIRS=. RUN_EXPENSIVE_TESTS=yes RUN_VERY_EXPENSIVE_TESTS=yes VERBOSE=no gl_public_submodule_commit="" srcdir="${path_GNU}" || : # Kill after 4 hours in case something gets stuck in make
+timeout -sKILL 4h make -j "$(nproc)" check ${RUN_TEST} SUBDIRS=. RUN_EXPENSIVE_TESTS=yes RUN_VERY_EXPENSIVE_TESTS=yes VERBOSE=no gl_public_submodule_commit="" srcdir="${path_GNU}" || : # Kill after 4 hours in case something gets stuck in make