diff --git a/core/src/main/groovy/jenkins/util/MarkFindingOutputStream.java b/core/src/main/java/jenkins/util/MarkFindingOutputStream.java
similarity index 100%
rename from core/src/main/groovy/jenkins/util/MarkFindingOutputStream.java
rename to core/src/main/java/jenkins/util/MarkFindingOutputStream.java
diff --git a/core/src/main/groovy/jenkins/util/ServerTcpPort.java b/core/src/main/java/jenkins/util/ServerTcpPort.java
similarity index 100%
rename from core/src/main/groovy/jenkins/util/ServerTcpPort.java
rename to core/src/main/java/jenkins/util/ServerTcpPort.java