diff --git a/lib/twitter/user.rb b/lib/twitter/user.rb
index 30e51ed4b..93e230454 100644
--- a/lib/twitter/user.rb
+++ b/lib/twitter/user.rb
@@ -4,7 +4,7 @@
 
 module Twitter
   class User < Twitter::BasicUser
-    PROFILE_IMAGE_SUFFIX_REGEX = /_normal(\.gif|\.jpe?g|\.png)$/
+    PROFILE_IMAGE_SUFFIX_REGEX = /_normal(\.gif|\.jpe?g|\.png)$/i
     include Twitter::Creatable
     include Twitter::Exceptable
     attr_reader :connections, :contributors_enabled, :default_profile,
diff --git a/spec/twitter/user_spec.rb b/spec/twitter/user_spec.rb
index ac5177cee..c19ca4982 100644
--- a/spec/twitter/user_spec.rb
+++ b/spec/twitter/user_spec.rb
@@ -185,6 +185,14 @@
         expect(user.profile_image_url(:mini)).to eq "http://a0.twimg.com/profile_images/1759857427/image1326743606_mini.png"
       end
     end
+    context "with capitalized file extension" do
+      it "returns the correct image" do
+        user = Twitter::User.new(:id => 7505382, :profile_image_url_https => "https://si0.twimg.com/profile_images/67759670/DSCN2136_normal.JPG")
+        expect(user.profile_image_url(:original)).to eq "http://si0.twimg.com/profile_images/67759670/DSCN2136.JPG"
+        expect(user.profile_image_url(:bigger)).to eq "http://si0.twimg.com/profile_images/67759670/DSCN2136_bigger.JPG"
+        expect(user.profile_image_url(:mini)).to eq "http://si0.twimg.com/profile_images/67759670/DSCN2136_mini.JPG"
+      end
+    end
   end
 
   describe "#profile_image_url_https" do
@@ -218,6 +226,14 @@
         expect(user.profile_image_url_https(:mini)).to eq "https://a0.twimg.com/profile_images/1759857427/image1326743606_mini.png"
       end
     end
+    context "with capitalized file extension" do
+      it "returns the correct image" do
+        user = Twitter::User.new(:id => 7505382, :profile_image_url_https => "https://si0.twimg.com/profile_images/67759670/DSCN2136_normal.JPG")
+        expect(user.profile_image_url_https(:original)).to eq "https://si0.twimg.com/profile_images/67759670/DSCN2136.JPG"
+        expect(user.profile_image_url_https(:bigger)).to eq "https://si0.twimg.com/profile_images/67759670/DSCN2136_bigger.JPG"
+        expect(user.profile_image_url_https(:mini)).to eq "https://si0.twimg.com/profile_images/67759670/DSCN2136_mini.JPG"
+      end
+    end
   end
 
   describe "#profile_image_url?" do