diff --git a/ProfanityFilter.Tests.Unit/ProfanityTests.cs b/ProfanityFilter.Tests.Unit/ProfanityTests.cs
index 33c48f2..9bb786b 100644
--- a/ProfanityFilter.Tests.Unit/ProfanityTests.cs
+++ b/ProfanityFilter.Tests.Unit/ProfanityTests.cs
@@ -898,5 +898,17 @@ public void ContainsProfanityReturnsTrueWhenProfanityIsADollarDollar()
 
             Assert.IsTrue(result);
         }
+
+        [TestMethod]
+        [DataRow("ASS")]
+        [DataRow("Ass")]
+        [DataRow("A$$")]
+        public void ContainsProfanityReturnsTrueForWordsWithUppercase(string input)
+        {
+            var filter = new ProfanityFilter();
+            var result = filter.ContainsProfanity(input);
+
+            Assert.IsTrue(result);
+        }
     }
 }
\ No newline at end of file
diff --git a/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs b/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs
index 3af0bc6..626ca05 100644
--- a/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs
+++ b/ProfanityFilter/ProfanityFilter/ProfanityFilter.cs
@@ -272,7 +272,7 @@ public bool ContainsProfanity(string term)
                 return false;
             }
 
-            Regex regex = new Regex(string.Format(@"(?:{0})", string.Join("|", potentialProfanities).Replace("$", "\\$"), RegexOptions.IgnoreCase));
+            Regex regex = new Regex(string.Format(@"(?:{0})", string.Join("|", potentialProfanities).Replace("$", "\\$")), RegexOptions.IgnoreCase);
 
             foreach (Match profanity in regex.Matches(term))
             {