diff --git a/src/main/java/edu/kit/kastel/sdq/artemis4j/grading/Annotation.java b/src/main/java/edu/kit/kastel/sdq/artemis4j/grading/Annotation.java
index 2a9a563..b619976 100644
--- a/src/main/java/edu/kit/kastel/sdq/artemis4j/grading/Annotation.java
+++ b/src/main/java/edu/kit/kastel/sdq/artemis4j/grading/Annotation.java
@@ -44,7 +44,7 @@ public final class Annotation {
     public Annotation(AnnotationDTO dto, MistakeType mistakeType) {
         this.uuid = dto.uuid();
         this.type = mistakeType;
-        this.filePath = dto.classFilePath();
+        this.filePath = dto.classFilePath().replace("\\", "/");
         this.startLine = dto.startLine();
         this.endLine = dto.endLine();
         this.source = dto.source() != null ? dto.source() : AnnotationSource.UNKNOWN;