diff --git a/app/core/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertOfficeController.java b/app/core/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertOfficeController.java
index a581a51d7..651444c69 100644
--- a/app/core/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertOfficeController.java
+++ b/app/core/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertOfficeController.java
@@ -56,7 +56,7 @@ public class ConvertOfficeController {
 
         // Check if the file is HTML and apply sanitization if needed
         String fileExtension = FilenameUtils.getExtension(originalFilename).toLowerCase();
-        if (fileExtension.equals("html") || fileExtension.equals("htm")) {
+        if ("html".equals(fileExtension) || "htm".equals(fileExtension)) {
             // Read and sanitize HTML content
             String htmlContent = new String(inputFile.getBytes(), StandardCharsets.UTF_8);
             String sanitizedHtml = customHtmlSanitizer.sanitize(htmlContent);