diff --git a/src/main/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgo.java b/src/main/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgo.java
index 1a8f27fac9cb..afa81a5fdc16 100644
--- a/src/main/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgo.java
+++ b/src/main/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgo.java
@@ -19,6 +19,8 @@ private PatternSearchUsingRabinKarpAlgo() {
     // I'm using Rabin-Karp algorithm that uses hashing to find pattern strings in a text.
     public static List<String> search(String text, String pattern) {
         List<String> result = new ArrayList<>();
+        text = text.toLowerCase();
+        pattern = pattern.toLowerCase();
         int m = pattern.length();
         int n = text.length();
         int prime = 101; // A prime number to mod hash values
diff --git a/src/test/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgoTest.java b/src/test/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgoTest.java
index c8d9679687b3..505558079ce2 100644
--- a/src/test/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgoTest.java
+++ b/src/test/java/com/thealgorithms/strings/PatternSearchUsingRabinKarpAlgoTest.java
@@ -65,7 +65,7 @@ public void testMultipleMatches() {
     public void testCaseInsensitiveSearch() {
         String text = "HelloWorld";
         String pattern = "helloworld";
-        List<String> result = PatternSearchUsingRabinKarpAlgo.search(text.toLowerCase(), pattern.toLowerCase());
+        List<String> result = PatternSearchUsingRabinKarpAlgo.search(text, pattern);
         assertFalse(result.isEmpty(), "Pattern should match regardless of case");
         assertEquals("Start: 0, End: 9, Substring: helloworld", result.get(0));
     }