1 files changed, 7 insertions, 5 deletions
diff --git a/spec/ruby/shared/rational/inspect.rb b/spec/ruby/shared/rational/inspect.rb
index a7fd42ccac..19691a2f25 100644
--- a/spec/ruby/shared/rational/inspect.rb
+++ b/spec/ruby/shared/rational/inspect.rb
@@ -1,11 +1,13 @@
 require_relative '../../spec_helper'
 
 describe :rational_inspect, shared: true do
-  conflicts_with :Prime do
-    it "returns a string representation of self" do
-      Rational(3, 4).inspect.should == "(3/4)"
-      Rational(-5, 8).inspect.should == "(-5/8)"
-      Rational(-1, -2).inspect.should == "(1/2)"
+  it "returns a string representation of self" do
+    Rational(3, 4).inspect.should == "(3/4)"
+    Rational(-5, 8).inspect.should == "(-5/8)"
+    Rational(-1, -2).inspect.should == "(1/2)"
+
+    # Guard against the Mathn library
+    guard -> { !defined?(Math.rsqrt) } do
       Rational(bignum_value, 1).inspect.should == "(#{bignum_value}/1)"
     end
   end