diff --git a/core/devmode/src/main/java/io/quarkus/dev/JavaCompilationProvider.java b/core/devmode/src/main/java/io/quarkus/dev/JavaCompilationProvider.java
index 595495286a16f..4d278df56fe8f 100644
--- a/core/devmode/src/main/java/io/quarkus/dev/JavaCompilationProvider.java
+++ b/core/devmode/src/main/java/io/quarkus/dev/JavaCompilationProvider.java
@@ -3,6 +3,7 @@
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -42,7 +43,8 @@ public void compile(Set<File> filesToCompile, Context context) {
             throw new RuntimeException("No system java compiler provided");
         }
         DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<>();
-        try (StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null);) {
+        try (StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null,
+                StandardCharsets.UTF_8)) {
 
             fileManager.setLocation(StandardLocation.CLASS_PATH, context.getClasspath());
             fileManager.setLocation(StandardLocation.CLASS_OUTPUT, Collections.singleton(context.getOutputDirectory()));