diff --git a/test/ruby/test_gc_compact.rb b/test/ruby/test_gc_compact.rb
index 1fa479ac6d..8a3f1f145d 100644
--- a/test/ruby/test_gc_compact.rb
+++ b/test/ruby/test_gc_compact.rb
@@ -310,7 +310,6 @@ class TestGCCompact < Test::Unit::TestCase
 
   def test_moving_arrays_down_size_pools
     omit if GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] == 1
-    pend "Flaky on some platforms" if /solaris|mswin/i =~ RUBY_PLATFORM
 
     assert_separately(%w[-robjspace], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)
     begin;
@@ -331,7 +330,6 @@ class TestGCCompact < Test::Unit::TestCase
 
   def test_moving_arrays_up_size_pools
     omit if GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] == 1
-    pend "Flaky on some platforms" if /solaris|mswin/i =~ RUBY_PLATFORM
 
     assert_separately(%w[-robjspace], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)
     begin;
@@ -354,7 +352,7 @@ class TestGCCompact < Test::Unit::TestCase
 
   def test_moving_objects_between_size_pools
     omit if GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] == 1
-    pend "Flaky on some platforms" if /solaris|mswin/i =~ RUBY_PLATFORM
+    omit "Flaky on Solaris" if /solaris/i =~ RUBY_PLATFORM
 
     assert_separately(%w[-robjspace], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)
     begin;
@@ -385,7 +383,6 @@ class TestGCCompact < Test::Unit::TestCase
 
   def test_moving_strings_up_size_pools
     omit if GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] == 1
-    pend "Flaky on some platforms" if /solaris|mswin/i =~ RUBY_PLATFORM
 
     assert_separately(%w[-robjspace], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)
     begin;
@@ -405,7 +402,6 @@ class TestGCCompact < Test::Unit::TestCase
 
   def test_moving_strings_down_size_pools
     omit if GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] == 1
-    pend "Flaky on some platforms" if /solaris|mswin/i =~ RUBY_PLATFORM
 
     assert_separately(%w[-robjspace], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)
     begin;
@@ -429,7 +425,7 @@ class TestGCCompact < Test::Unit::TestCase
     # This test fails on Solaris SPARC with the following error and I can't figure out why:
     #   TestGCCompact#test_moving_hashes_down_size_pools
     #   Expected 499 to be >= 500.
-    pend "Flaky on some platforms" if /solaris|mswin/i =~ RUBY_PLATFORM
+    omit if /sparc-solaris/ =~ RUBY_PLATFORM
 
     assert_separately(%w[-robjspace], "#{<<~"begin;"}\n#{<<~"end;"}", timeout: 10, signal: :SEGV)
     begin;