diff --git a/bignum.c b/bignum.c
index 0515e2f0d6..7c55366ecb 100644
--- a/bignum.c
+++ b/bignum.c
@@ -5512,7 +5512,7 @@ rb_big_le(VALUE x, VALUE y)
  *
  *  Returns <code>true</code> only if <i>obj</i> has the same value
  *  as <i>big</i>. Contrast this with Integer#eql?, which requires
- *  <i>obj</i> to be a Integer.
+ *  <i>obj</i> to be an Integer.
  *
  *     68719476736 == 68719476736.0   #=> true
  */
diff --git a/class.c b/class.c
index a76609112f..6d5cabcc6d 100644
--- a/class.c
+++ b/class.c
@@ -1881,7 +1881,7 @@ rb_singleton_class_get(VALUE obj)
  * Returns the singleton class of \a obj. Creates it if necessary.
  *
  * \param obj an arbitrary object.
- * \throw TypeError if \a obj is a Integer or a Symbol.
+ * \throw TypeError if \a obj is an Integer or a Symbol.
  * \return the singleton class.
  *
  * \post \a obj has its own singleton class.
diff --git a/process.c b/process.c
index 0b2fdeb840..2198b9a99c 100644
--- a/process.c
+++ b/process.c
@@ -670,7 +670,7 @@ rb_last_status_clear(void)
  *  call-seq:
  *     stat.to_i     -> integer
  *
- *  Returns the bits in _stat_ as a Integer. Poking
+ *  Returns the bits in _stat_ as an Integer. Poking
  *  around in these bits is platform dependent.
  *
  *     fork { exit 0xab }         #=> 26566
diff --git a/spec/mspec/spec/helpers/io_spec.rb b/spec/mspec/spec/helpers/io_spec.rb
index 19f8384912..4fa1f97d46 100644
--- a/spec/mspec/spec/helpers/io_spec.rb
+++ b/spec/mspec/spec/helpers/io_spec.rb
@@ -60,7 +60,7 @@ describe Object, "#new_fd" do
     rm_r @name
   end
 
-  it "returns a Integer that can be used to create an IO instance" do
+  it "returns an Integer that can be used to create an IO instance" do
     fd = new_fd @name
     fd.should be_kind_of(Integer)
 
diff --git a/spec/ruby/core/integer/shared/equal.rb b/spec/ruby/core/integer/shared/equal.rb
index 03416b60f5..4a5a236ffa 100644
--- a/spec/ruby/core/integer/shared/equal.rb
+++ b/spec/ruby/core/integer/shared/equal.rb
@@ -11,7 +11,7 @@ describe :integer_equal, shared: true do
       10.send(@method, bignum_value).should == false
     end
 
-    it "calls 'other == self' if the given argument is not a Integer" do
+    it "calls 'other == self' if the given argument is not an Integer" do
       1.send(@method, '*').should == false
 
       obj = mock('one other')
diff --git a/spec/ruby/core/marshal/shared/load.rb b/spec/ruby/core/marshal/shared/load.rb
index 85e645507f..e63fd8adda 100644
--- a/spec/ruby/core/marshal/shared/load.rb
+++ b/spec/ruby/core/marshal/shared/load.rb
@@ -667,7 +667,7 @@ describe :marshal_load, shared: true do
     end
   end
 
-  describe "for a Integer" do
+  describe "for an Integer" do
     it "loads 0" do
       Marshal.send(@method, "\004\bi\000").should == 0
       Marshal.send(@method, "\004\bi\005").should == 0
diff --git a/spec/ruby/core/rational/comparison_spec.rb b/spec/ruby/core/rational/comparison_spec.rb
index b2784f3e7d..9d8e7fd7ee 100644
--- a/spec/ruby/core/rational/comparison_spec.rb
+++ b/spec/ruby/core/rational/comparison_spec.rb
@@ -4,7 +4,7 @@ describe "Rational#<=> when passed a Rational object" do
   it_behaves_like :rational_cmp_rat, :<=>
 end
 
-describe "Rational#<=> when passed a Integer object" do
+describe "Rational#<=> when passed an Integer object" do
   it_behaves_like :rational_cmp_int, :<=>
 end
 
diff --git a/spec/ruby/library/win32ole/win32ole_variable/value_spec.rb b/spec/ruby/library/win32ole/win32ole_variable/value_spec.rb
index c15f64c2c5..4f240b561c 100644
--- a/spec/ruby/library/win32ole/win32ole_variable/value_spec.rb
+++ b/spec/ruby/library/win32ole/win32ole_variable/value_spec.rb
@@ -9,7 +9,7 @@ platform_is :windows do
       @var = ole_type.variables[0]
     end
 
-    it "returns a Integer" do
+    it "returns an Integer" do
       # according to doc, this could return nil
       @var.value.should be_kind_of Integer
     end