diff --git a/ruby.spec b/ruby.spec
index 24a9b86..942088f 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -881,7 +881,10 @@ MSPECOPTS="$MSPECOPTS -P 'File.utime allows Time instances in the far future to
 MSPECOPTS="$MSPECOPTS -P 'File.lchmod returns false from \#respond_to?'"
 MSPECOPTS="$MSPECOPTS -P 'File.lchmod raises a NotImplementedError when called'"
 
-make check TESTS="-v $DISABLE_TESTS" MSPECOPT="-fs $MSPECOPTS"
+# Give an option to increase the timeout in tests.
+# https://bugs.ruby-lang.org/issues/16921
+%{?test_timeout_scale:RUBY_TEST_TIMEOUT_SCALE="%{test_timeout_scale}"} \
+  make check TESTS="-v $DISABLE_TESTS" MSPECOPT="-fs $MSPECOPTS"
 
 %files
 %license BSDL