diff --git a/core/signal/signame_spec.rb b/core/signal/signame_spec.rb
index 38108e633..adfe895d9 100644
--- a/core/signal/signame_spec.rb
+++ b/core/signal/signame_spec.rb
@@ -19,6 +19,12 @@
     -> { Signal.signame("hello") }.should raise_error(TypeError)
   end
 
+  it "raises a TypeError when the passed argument responds to #to_int but does not return an Integer" do
+    obj = mock('signal')
+    obj.should_receive(:to_int).and_return('not an int')
+    -> { Signal.signame(obj) }.should raise_error(TypeError)
+  end
+
   platform_is_not :windows do
     it "the original should take precedence over alias when looked up by number" do
       Signal.signame(Signal.list["ABRT"]).should == "ABRT"
diff --git a/core/signal/trap_spec.rb b/core/signal/trap_spec.rb
index 3fa0eff10..b3186cda9 100644
--- a/core/signal/trap_spec.rb
+++ b/core/signal/trap_spec.rb
@@ -234,7 +234,7 @@
       Signal.trap(hup, @saved_trap).should equal(@proc)
     end
 
-    it "doest not call #to_int on an object to convert to an Integer" do
+    it "does not call #to_int on an object to convert to an Integer" do
       obj = mock("signal")
       obj.should_not_receive(:to_int)
       -> { Signal.trap obj, @proc }.should raise_error(ArgumentError, /bad signal type/)