diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 01798fb8a28f..6b61e8d2bc6f 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -1021,6 +1021,12 @@ def self.find_by_name(name, *requirements)
     Gem::Dependency.new(name, *requirements).to_spec
   end
 
+  ##
+  # Find the best specification matching a +full_name+.
+  def self.find_by_full_name(full_name)
+    stubs.find {|s| s.full_name == full_name }&.to_spec
+  end
+
   ##
   # Return the best specification that contains the file matching +path+.
 
@@ -1606,6 +1612,8 @@ def build_args
   def build_extensions # :nodoc:
     return if extensions.empty?
     return if default_gem?
+    # we need to fresh build when same name and version of default gems
+    return if self.class.find_by_full_name(full_name)&.default_gem?
     return if File.exist? gem_build_complete_path
     return if !File.writable?(base_dir)
     return if !File.exist?(File.join(base_dir, "extensions"))
diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index 1952192abab8..56ca7acaf272 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -3726,6 +3726,23 @@ def test_find_by_name_prerelease
     assert Gem::Specification.find_by_name "b", ">1"
   end
 
+  def test_find_by_full_name
+    pl = Gem::Platform.new "x86_64-linux"
+
+    a = util_spec "a", "1"
+    install_specs a
+
+    a_pl = util_spec("a", "1") {|s| s.platform = pl }
+    install_specs a_pl
+
+    assert_equal a, Gem::Specification.find_by_full_name("a-1")
+    assert_equal a_pl, Gem::Specification.find_by_full_name("a-1-x86_64-linux")
+
+    assert_nil Gem::Specification.find_by_full_name("a-2")
+    assert_nil Gem::Specification.find_by_full_name("b-1")
+    assert_nil Gem::Specification.find_by_full_name("a-1-arm64-linux")
+  end
+
   def test_find_by_path
     a = util_spec "foo", "1", nil, "lib/foo.rb"