diff --git a/drools/src/main/java/com/baeldung/drools/config/DroolsBeanFactory.java b/drools/src/main/java/com/baeldung/drools/config/DroolsBeanFactory.java
index bbc1f3170a..fd2090aecb 100644
--- a/drools/src/main/java/com/baeldung/drools/config/DroolsBeanFactory.java
+++ b/drools/src/main/java/com/baeldung/drools/config/DroolsBeanFactory.java
@@ -20,7 +20,7 @@ public class DroolsBeanFactory {
 
     private  KieFileSystem getKieFileSystem() {
         KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
-        List<String> rules = Arrays.asList("BackwardChaining.drl", "SuggestApplicant.drl", "Product_rules.xls");
+        List<String> rules = Arrays.asList("BackwardChaining.drl", "SuggestApplicant.drl", "Product_rules.drl.xls");
         for(String rule:rules) {
             kieFileSystem.write(ResourceFactory.newClassPathResource(rule));
         }
@@ -52,7 +52,7 @@ public class DroolsBeanFactory {
 
         kieFileSystem.write(ResourceFactory.newClassPathResource("com/baeldung/drools/rules/BackwardChaining.drl"));
         kieFileSystem.write(ResourceFactory.newClassPathResource("com/baeldung/drools/rules/SuggestApplicant.drl"));
-        kieFileSystem.write(ResourceFactory.newClassPathResource("com/baeldung/drools/rules/Product_rules.xls"));
+        kieFileSystem.write(ResourceFactory.newClassPathResource("com/baeldung/drools/rules/Product_rules.drl.xls"));
         
         KieBuilder kb = kieServices.newKieBuilder(kieFileSystem);
         kb.buildAll();
@@ -83,7 +83,7 @@ public class DroolsBeanFactory {
 
     /*
      * Can be used for debugging
-     * Input excelFile example: com/baeldung/drools/rules/Discount.xls
+     * Input excelFile example: com/baeldung/drools/rules/Discount.drl.xls
      */
     public String getDrlFromExcel(String excelFile) {
         DecisionTableConfiguration configuration = KnowledgeBuilderFactory.newDecisionTableConfiguration();
diff --git a/drools/src/main/resources/com/baeldung/drools/rules/Discount.xls b/drools/src/main/resources/com/baeldung/drools/rules/Discount.drl.xls
similarity index 100%
rename from drools/src/main/resources/com/baeldung/drools/rules/Discount.xls
rename to drools/src/main/resources/com/baeldung/drools/rules/Discount.drl.xls
diff --git a/drools/src/main/resources/com/baeldung/drools/rules/Product_rules.xls b/drools/src/main/resources/com/baeldung/drools/rules/Product_rules.drl.xls
similarity index 100%
rename from drools/src/main/resources/com/baeldung/drools/rules/Product_rules.xls
rename to drools/src/main/resources/com/baeldung/drools/rules/Product_rules.drl.xls
diff --git a/drools/src/test/java/com/baeldung/drools/service/DiscountExcelIntegrationTest.java b/drools/src/test/java/com/baeldung/drools/service/DiscountExcelIntegrationTest.java
index c3c4ebd4f8..49a5f81d38 100644
--- a/drools/src/test/java/com/baeldung/drools/service/DiscountExcelIntegrationTest.java
+++ b/drools/src/test/java/com/baeldung/drools/service/DiscountExcelIntegrationTest.java
@@ -18,7 +18,7 @@ public class DiscountExcelIntegrationTest {
 
     @Before
     public void setup() {
-        Resource resource = ResourceFactory.newClassPathResource("com/baeldung/drools/rules/Discount.xls", getClass());
+        Resource resource = ResourceFactory.newClassPathResource("com/baeldung/drools/rules/Discount.drl.xls", getClass());
         kSession = new DroolsBeanFactory().getKieSession(resource);
     }