diff --git a/cas/pom.xml b/cas/pom.xml
index ac766ae5bf..6d141277c5 100644
--- a/cas/pom.xml
+++ b/cas/pom.xml
@@ -15,7 +15,7 @@
 
     <modules>
         <module>cas-secured-app</module>
-		<module>cas-server</module>
+        <module>cas-server</module>
     </modules>
 
 </project>
diff --git a/guava-modules/pom.xml b/guava-modules/pom.xml
index 7a5f217c15..fed9e446f7 100644
--- a/guava-modules/pom.xml
+++ b/guava-modules/pom.xml
@@ -15,8 +15,8 @@
 
     <modules>
         <module>guava-18</module>
-		<module>guava-19</module>
-		<module>guava-21</module>
+        <module>guava-19</module>
+        <module>guava-21</module>
     </modules>
 
 </project>
diff --git a/logging-modules/pom.xml b/logging-modules/pom.xml
index d48955b1b8..a303e50ff1 100644
--- a/logging-modules/pom.xml
+++ b/logging-modules/pom.xml
@@ -15,9 +15,9 @@
 
     <modules>
         <module>log4j</module>
-		<module>log4j2</module>
-		<module>logback</module>
-		<module>log-mdc</module>
+        <module>log4j2</module>
+        <module>logback</module>
+        <module>log-mdc</module>
     </modules>
 
 </project>
diff --git a/persistence-modules/pom.xml b/persistence-modules/pom.xml
index beba135d7f..47c733d8a7 100644
--- a/persistence-modules/pom.xml
+++ b/persistence-modules/pom.xml
@@ -54,5 +54,5 @@
         <module>spring-hibernate-5</module>
         <module>spring-hibernate4</module>
         <module>spring-jpa</module>
-	</modules>
+    </modules>
 </project>
diff --git a/rule-engines/pom.xml b/rule-engines/pom.xml
index 2b3f2f530b..2ce82ed22b 100644
--- a/rule-engines/pom.xml
+++ b/rule-engines/pom.xml
@@ -15,8 +15,8 @@
 
     <modules>
         <module>easy-rules</module>
-		<module>openl-tablets</module>
-		<module>rulebook</module>
+        <module>openl-tablets</module>
+        <module>rulebook</module>
     </modules>
 
 </project>
diff --git a/spring-security-client/pom.xml b/spring-security-client/pom.xml
index aa424ca759..96ac837a09 100644
--- a/spring-security-client/pom.xml
+++ b/spring-security-client/pom.xml
@@ -21,5 +21,5 @@
         <module>spring-security-thymeleaf-authentication</module>
         <module>spring-security-thymeleaf-authorize</module>
         <module>spring-security-thymeleaf-config</module>
-	</modules>
+    </modules>
 </project>
diff --git a/testing-modules/pom.xml b/testing-modules/pom.xml
index 6a3c2399f8..39047fb756 100644
--- a/testing-modules/pom.xml
+++ b/testing-modules/pom.xml
@@ -32,5 +32,5 @@
         <module>test-containers</module>
         <module>testing</module>
         <module>testng</module>
-	</modules>
+    </modules>
 </project>