diff --git a/pom.xml b/pom.xml
index 5766237..c840678 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,8 @@
         <sonar.working.directory>${project.build.directory}/sonar</sonar.working.directory>
         <sonar.host.url>https://sonar.wavesoftware.pl</sonar.host.url>
         <sonar.java.coveragePlugin>jacoco</sonar.java.coveragePlugin>
-        <java.source.version>6</java.source.version>
+	<sonar.java.source>6</sonar.java.source>
+	<java.source.version>${sonar.java.source}</java.source.version>
         <maven.compiler.source>1.${java.source.version}</maven.compiler.source>
         <maven.compiler.target>${maven.compiler.source}</maven.compiler.target>
         <coveralls.skip>${skipTests}</coveralls.skip>
@@ -301,4 +302,4 @@
         </pluginManagement>
     </build>
     
-</project>
\ No newline at end of file
+</project>
diff --git a/sonar-project.properties b/sonar-project.properties
deleted file mode 100644
index a5e2bac..0000000
--- a/sonar-project.properties
+++ /dev/null
@@ -1 +0,0 @@
-java.source.version=6