diff --git a/test/ruby/test_fiber.rb b/test/ruby/test_fiber.rb
index b2518c32f0..26f8268140 100644
--- a/test/ruby/test_fiber.rb
+++ b/test/ruby/test_fiber.rb
@@ -392,7 +392,7 @@ class TestFiber < Test::Unit::TestCase
             xpid = fork do
               # enough to trigger GC on old root fiber
               count = 10000
-              count = 1000 if /openbsd/i =~ RUBY_PLATFORM
+              count = 1000 if /solaris|openbsd/i =~ RUBY_PLATFORM
               count.times do
                 Fiber.new {}.transfer
                 Fiber.new { Fiber.yield }