diff --git a/test/apps/rails3.1/app/models/product.rb b/test/apps/rails3.1/app/models/product.rb
index c879ee1ed29159b0c77455aec9644e79a474ea9e..e8755435ea7603a1a2cc0e1cfaca6f7d454c229d 100644
--- a/test/apps/rails3.1/app/models/product.rb
+++ b/test/apps/rails3.1/app/models/product.rb
@@ -169,4 +169,8 @@ class Product < ActiveRecord::Base
     #Should not warn
     Product.last("blah = '#{params[:id].to_f}'")
   end
+
+  def test_interpolation_in_first_arg
+    Product.where("x = #{params[:x]} AND y = ?", y)
+  end
 end
diff --git a/test/tests/test_rails31.rb b/test/tests/test_rails31.rb
index c3deaea2ff0c20b2a24a360575f03d6eb058cee3..3ea95faffa4ba78529b0bcafb0b7c2478575a9e7 100644
--- a/test/tests/test_rails31.rb
+++ b/test/tests/test_rails31.rb
@@ -15,7 +15,7 @@ class Rails31Tests < Test::Unit::TestCase
       :model => 0,
       :template => 4,
       :controller => 1,
-      :warning => 44 }
+      :warning => 45 }
   end
 
   def test_without_protection
@@ -411,6 +411,15 @@ class Rails31Tests < Test::Unit::TestCase
       :file => /product\.rb/
   end
 
+  def test_sql_injection_interpolation_in_first_arg
+    assert_warning :type => :warning,
+      :warning_type => "SQL Injection",
+      :line => 174,
+      :message => /^Possible\ SQL\ injection/,
+      :confidence => 0,
+      :file => /product\.rb/
+  end
+
   def test_select_vulnerability
     assert_warning :type => :template,
       :warning_type => "Cross Site Scripting",