diff --git a/lib/saulabs/gauss/distribution.rb b/lib/saulabs/gauss/distribution.rb
index 80d83a6..2d6e19a 100644
--- a/lib/saulabs/gauss/distribution.rb
+++ b/lib/saulabs/gauss/distribution.rb
@@ -131,6 +131,7 @@ def +(other)
       end
     
       def ==(other)
+        return false unless other.kind_of?(self.class)
         self.mean == other.mean && self.variance == other.variance
       end
   
diff --git a/spec/saulabs/gauss/distribution_spec.rb b/spec/saulabs/gauss/distribution_spec.rb
index 0006b56..12f973c 100644
--- a/spec/saulabs/gauss/distribution_spec.rb
+++ b/spec/saulabs/gauss/distribution_spec.rb
@@ -188,3 +188,16 @@
   end
   
 end
+
+describe Gauss::Distribution, "#==" do
+  let(:distribution) { Gauss::Distribution.with_deviation(25.0, 8.333333) }
+  
+  it "should be reflexive" do
+    distribution.should == distribution
+  end
+
+  it "should not equal any object of another class" do
+    distribution.should_not == Object.new
+  end
+  
+end