diff --git a/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/generator/ProjectBuilder.java b/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/generator/ProjectBuilder.java
index 17f41da..21faf30 100644
--- a/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/generator/ProjectBuilder.java
+++ b/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/generator/ProjectBuilder.java
@@ -749,7 +749,7 @@ public class ProjectBuilder {
 
 		try {
 
-			ProcessBuilder pb = new ProcessBuilder("javac", "-cp",
+			ProcessBuilder pb = new ProcessBuilder("javac", "-encoding", "utf-8","-cp",
 					tempDirectory.toAbsolutePath().toString() + "/*",
 					packageHome.toAbsolutePath().toString()
 							+ File.separator