diff --git a/test/lib/test/unit/assertions.rb b/test/lib/test/unit/assertions.rb
index 92f754064a..fcd9795402 100644
--- a/test/lib/test/unit/assertions.rb
+++ b/test/lib/test/unit/assertions.rb
@@ -715,7 +715,7 @@ eom
         skip
       end
 
-      def assert_cpu_usage_low(msg = nil, pct: 0.005)
+      def assert_cpu_usage_low(msg = nil, pct: 0.015)
         require 'benchmark'
         tms = Benchmark.measure(msg || '') { yield }
         max = pct * tms.real