diff --git a/spec/ruby/core/bignum/bit_and_spec.rb b/spec/ruby/core/bignum/bit_and_spec.rb
index d77fa4b..d141f7b 100644
--- a/spec/ruby/core/bignum/bit_and_spec.rb
+++ b/spec/ruby/core/bignum/bit_and_spec.rb
@@ -12,9 +12,21 @@ describe "Bignum#&" do
     (@bignum & bignum_value(9921)).should == 9223372036854775809

     ((2*bignum_value) & 1).should == 0
+    ((2*bignum_value) & (2*bignum_value)).should == 18446744073709551616
+  end
+
+  it "returns self bitwise AND other when one operand is negative" do
     ((2*bignum_value) & -1).should == 18446744073709551616
     ((4*bignum_value) & -1).should == 36893488147419103232
-    ((2*bignum_value) & (2*bignum_value)).should == 18446744073709551616
+    (@bignum & -0xffffffffffffff5).should == 9223372036854775809
+    (@bignum & -@bignum).should == 1
+    (@bignum & -0x8000000000000000).should == 9223372036854775808
+  end
+
+  it "returns self bitwise AND other when both operands are negative" do
+    (-@bignum & -0x4000000000000005).should == -13835058055282163717
+    (-@bignum & -@bignum).should == -9223372036854775813
+    (-@bignum & -0x4000000000000000).should == -13835058055282163712
   end

   ruby_version_is ""..."1.9" do
diff --git a/spec/ruby/core/bignum/bit_or_spec.rb b/spec/ruby/core/bignum/bit_or_spec.rb
index 45ddb6d..d98ed73 100644
--- a/spec/ruby/core/bignum/bit_or_spec.rb
  +++ b/spec/ruby/core/bignum/bit_or_spec.rb
@@ -11,6 +11,18 @@ describe "Bignum#|" do
     (@bignum | bignum_value).should == 9223372036854775819
   end

+  it "returns self bitwise OR other when one operand is negative" do
+    (@bignum | -0x40000000000000000).should == -64563604257983430645
+    (@bignum | -@bignum).should == -1
+    (@bignum | -0x8000000000000000).should == -9223372036854775797
+  end
+
+  it "returns self bitwise OR other when both operands are negative" do
+    (-@bignum | -0x4000000000000005).should == -1
+    (-@bignum | -@bignum).should == -9223372036854775819
+    (-@bignum | -0x4000000000000000).should == -11
+  end
+
   ruby_version_is ""..."1.9" do
     it "coerces Float arguments to Integers" do
       (bignum_value | bignum_value(0xffff).to_f).should == 9223372036854841344
diff --git a/spec/ruby/core/bignum/bit_xor_spec.rb b/spec/ruby/core/bignum/bit_xor_spec.rb
index 38a5850..bc57ad8 100644
--- a/spec/ruby/core/bignum/bit_xor_spec.rb
+++ b/spec/ruby/core/bignum/bit_xor_spec.rb
@@ -11,6 +11,18 @@ describe "Bignum#^" do
     (@bignum ^ 14).should == 9223372036854775836
   end

+  it "returns self bitwise EXCLUSIVE OR other when one operand is negative" do
+    (@bignum ^ -0x40000000000000000).should == -64563604257983430638
+    (@bignum ^ -@bignum).should == -4
+    (@bignum ^ -0x8000000000000000).should == -18446744073709551598
+  end
+
+  it "returns self bitwise EXCLUSIVE OR other when both operands are negative" do
+    (-@bignum ^ -0x40000000000000000).should == 64563604257983430638
+    (-@bignum ^ -@bignum).should == 0
+    (-@bignum ^ -0x4000000000000000).should == 13835058055282163694
+  end
+
   ruby_version_is ""..."1.9" do
     it "coerces Float arguments into Integers" do
       (@bignum ^ 14.5).should == 9223372036854775836