diff --git a/nbdkit.spec b/nbdkit.spec
index 8a2df7b..ad9e793 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -423,15 +423,6 @@ export LIBGUESTFS_TRACE=1
 # usually doesn't work on i686, so it is disabled.
 %ifnarch %{arm} %{ix86} ppc %{power64}
 
-# test-ruby throws a SystemStackError (stack overflow) for unknown
-# reasons with glibc >= 2.26.9000 or ruby >= 2.5.0.
-pushd tests
-make check TESTS=""
-rm -f test-ruby
-echo 'exit 77' > test-ruby
-chmod +x,-w test-ruby
-popd
-
 make check -j1 || {
     cat tests/test-suite.log
     exit 1