2 files changed, 4 insertions, 4 deletions
diff --git a/spec/ruby/library/matrix/divide_spec.rb b/spec/ruby/library/matrix/divide_spec.rb
index d656985f38..205bc5d892 100644
--- a/spec/ruby/library/matrix/divide_spec.rb
+++ b/spec/ruby/library/matrix/divide_spec.rb
@@ -14,13 +14,12 @@ describe "Matrix#/" do
     (@a / @b).should be_close_to_matrix([[2.5, -1.5], [1.5, -0.5]])
   end
 
-  conflicts_with :Prime do
+  # Guard against the Mathn library
+  guard -> { !defined?(Math.rsqrt) } do
     it "returns the result of dividing self by a Fixnum" do
       (@a / 2).should == Matrix[ [0, 1], [1, 2] ]
     end
-  end
 
-  conflicts_with :Prime do
     it "returns the result of dividing self by a Bignum" do
       (@a / bignum_value).should == Matrix[ [0, 0], [0, 0] ]
     end
diff --git a/spec/ruby/library/matrix/real_spec.rb b/spec/ruby/library/matrix/real_spec.rb
index e3648e4769..38033c63c8 100644
--- a/spec/ruby/library/matrix/real_spec.rb
+++ b/spec/ruby/library/matrix/real_spec.rb
@@ -16,7 +16,8 @@ describe "Matrix#real?" do
     Matrix[ [Complex(1,1), 2], [3, 4] ].real?.should be_false
   end
 
-  conflicts_with :CMath do
+  # Guard against the Mathn library
+  guard -> { !defined?(Math.rsqrt) } do
     it "returns false if one element is a Complex whose imaginary part is 0" do
       Matrix[ [Complex(1,0), 2], [3, 4] ].real?.should be_false
     end