diff --git a/spec/ruby/core/file/chmod_spec.rb b/spec/ruby/core/file/chmod_spec.rb
index f42dea6585..d98f997d4c 100644
--- a/spec/ruby/core/file/chmod_spec.rb
+++ b/spec/ruby/core/file/chmod_spec.rb
@@ -15,36 +15,9 @@ describe "File#chmod" do
     @file.chmod(0755).should == 0
   end
 
-  platform_is_not :freebsd, :netbsd, :openbsd, :darwin do
-    it "always succeeds with any numeric values" do
-      vals = [-2**30, -2**16, -2**8, -2, -1,
-        -0.5, 0, 1, 2, 5.555575, 16, 32, 64, 2**8, 2**16, 2**30]
-      vals.each { |v|
-        lambda { @file.chmod(v) }.should_not raise_error
-      }
-    end
-  end
-
-  # -256, -2 and -1 raise Errno::EFTYPE on NetBSD
-  platform_is :netbsd do
-    it "always succeeds with any numeric values" do
-      vals = [-2**30, -2**16, #-2**8, -2, -1,
-        -0.5, 0, 1, 2, 5.555575, 16, 32, 64, 2**8, 2**16, 2**30]
-      vals.each { |v|
-        lambda { @file.chmod(v) }.should_not raise_error
-      }
-    end
-  end
-
-  # -256, -2 and -1 raise Errno::EINVAL on OpenBSD
-  platform_is :freebsd, :openbsd, :darwin do
-    it "always succeeds with any numeric values" do
-      vals = [#-2**30, -2**16, -2**8, -2, -1,
-        -0.5, 0, 1, 2, 5.555575, 16, 32, 64, 2**8]#, 2**16, 2**30
-      vals.each { |v|
-        lambda { @file.chmod(v) }.should_not raise_error
-      }
-    end
+  it "raises RangeError with too large values" do
+    -> { @file.chmod(2**64) }.should raise_error(RangeError)
+    -> { @file.chmod(-2**63 - 1) }.should raise_error(RangeError)
   end
 
   it "invokes to_int on non-integer argument" do
@@ -123,73 +96,9 @@ describe "File.chmod" do
     @count.should == 1
   end
 
-  platform_is_not :freebsd, :netbsd, :openbsd, :darwin do
-    it "always succeeds with any numeric values" do
-      vals = [-2**30, -2**16, -2**8, -2, -1,
-        -0.5, 0, 1, 2, 5.555575, 16, 32, 64, 2**8, 2**16, 2**30]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should_not raise_error
-      }
-    end
-  end
-
-  # -256, -2 and -1 raise Errno::EFTYPE on NetBSD
-  platform_is :netbsd do
-    it "always succeeds with any numeric values" do
-      vals = [-2**30, -2**16, #-2**8, -2, -1,
-        -0.5, 0, 1, 2, 5.555575, 16, 32, 64, 2**8, 2**16, 2**30]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should_not raise_error
-      }
-    end
-  end
-
-  platform_is :darwin do
-    it "succeeds with valid values" do
-      vals = [-2**8, -2, -1, -0.5, 0, 1, 2, 5.555575, 16, 32, 64, 2**8]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should_not raise_error
-      }
-    end
-
-    it "fails with invalid values" do
-      vals = [-2**30, -2**16, 2**16, 2**30]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should raise_error(RangeError)
-      }
-    end
-  end
-
-  platform_is :freebsd, :openbsd do
-    it "succeeds with valid values" do
-      vals = [-0.5, 0, 1, 2, 5.555575, 16, 32, 64, 2**8]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should_not raise_error
-      }
-    end
-  end
-
-  # -256, -2 and -1 raise Errno::EFTYPE on FreeBSD
-  platform_is :freebsd do
-    it "fails with invalid values" do
-      vals = [-2**30, -2**16, 2**16, 2**30]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should raise_error(RangeError)
-      }
-      vals = [-2**8, -2, -1, 65535]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should raise_error(Errno::EFTYPE)
-      }
-    end
-  end
-
-  platform_is :openbsd do
-    it "fails with invalid values" do
-      vals = [-2**30, -2**16, -2**8, -2, -1, 2**16, 2**30]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should raise_error(Errno::EINVAL)
-      }
-    end
+  it "raises RangeError with too large values" do
+    -> { File.chmod(2**64, @file) }.should raise_error(RangeError)
+    -> { File.chmod(-2**63 - 1, @file) }.should raise_error(RangeError)
   end
 
   it "accepts an object that has a #to_path method" do
diff --git a/spec/ruby/core/file/umask_spec.rb b/spec/ruby/core/file/umask_spec.rb
index 53a07b6a54..4008cad449 100644
--- a/spec/ruby/core/file/umask_spec.rb
+++ b/spec/ruby/core/file/umask_spec.rb
@@ -30,31 +30,9 @@ describe "File.umask" do
     end
   end
 
-  platform_is_not :freebsd, :darwin do
-    it "always succeeds with any integer values" do
-      vals = [-2**30, -2**16, -2**8, -2,
-              -1.5, -1, 0.5, 0, 1, 2, 7.77777, 16, 32, 64, 2**8, 2**16, 2**30]
-      vals.each { |v|
-        lambda { File.umask(v) }.should_not raise_error
-      }
-    end
-  end
-
-  platform_is :freebsd, :darwin do
-    it "always succeeds with any integer values" do
-      vals = [-2**8, -2,
-              -1.5, -1, 0.5, 0, 1, 2, 7.77777, 16, 32, 64, 2**8]
-      vals.each { |v|
-        lambda { File.umask(v) }.should_not raise_error
-      }
-    end
-
-    it "fails with invalid values" do
-      vals = [-2**30, -2**16, 2**16, 2**30]
-      vals.each { |v|
-        lambda { File.chmod(v, @file) }.should raise_error(RangeError)
-      }
-    end
+  it "raises RangeError with too large values" do
+    -> { File.umask(2**64) }.should raise_error(RangeError)
+    -> { File.umask(-2**63 - 1) }.should raise_error(RangeError)
   end
 
   it "raises ArgumentError when more than one argument is provided" do