diff --git a/client/src/composables.ts b/client/src/composables.ts
index d8df4ac5..32102146 100644
--- a/client/src/composables.ts
+++ b/client/src/composables.ts
@@ -193,7 +193,9 @@ export function useCourseData(courseSlug: string) {
       log.error(result.error);
     }
 
-    const courseData = cloneDeep(result.data?.course) as Course;
+    // VBV-757: clone data from `COURSE_QUERY` here, so that each user in
+    // `useCourseDataWithCompletion` has its own completion instance in the course
+    const courseData = cloneDeep(result.data?.course) as unknown as Course;
     course.value = courseData;
     actionCompetences.value = courseData.action_competences as ActionCompetence[];
     learningPath.value = courseData.learning_path as LearningPathType;
diff --git a/client/src/types.ts b/client/src/types.ts
index 93ed9552..a24f6ecb 100644
--- a/client/src/types.ts
+++ b/client/src/types.ts
@@ -204,6 +204,8 @@ export interface Course {
   slug: string;
   profiles: string[];
   configuration: CourseConfiguration;
+  learning_path?: LearningPathType;
+  action_competences?: ActionCompetence[];
 }
 
 export interface CourseCategory {