diff --git a/de.hftstuttgart.buildingphysics.parent/pom.xml b/de.hftstuttgart.buildingphysics.parent/pom.xml
index e8eb48cf878f3f2b5f7295f62999d1e380e2da0b..effb80a1a1ce884ae770c3e6995c653759384368 100644
--- a/de.hftstuttgart.buildingphysics.parent/pom.xml
+++ b/de.hftstuttgart.buildingphysics.parent/pom.xml
@@ -18,6 +18,11 @@
 				<groupId>org.eclipse.tycho</groupId>
 				<artifactId>tycho-maven-plugin</artifactId>
 				<version>${tycho-version}</version>
+				<configuration>
+					<source>15</source>
+					<target>15</target>
+					<encoding>UTF-8</encoding>
+				</configuration>
 				<extensions>true</extensions>
 			</plugin>