diff --git a/build.gradle b/build.gradle
index d27aa0f..beb3ff0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -58,7 +58,7 @@ dependencies {
     testImplementation ("org.awaitility:awaitility:4.0.1")
 }
 
-sourceCompatibility = 8
+sourceCompatibility = 1.8
 archivesBaseName = "matsim"
 josm {
     josmCompileVersion = 17428