diff --git a/src/app/degree-planner/store/reducer.ts b/src/app/degree-planner/store/reducer.ts
index 05b3dffb9293227d607a4e730ebb932edcab5c3e..b7ca18ed5300244803b468f37c0e8ba503c4719c 100644
--- a/src/app/degree-planner/store/reducer.ts
+++ b/src/app/degree-planner/store/reducer.ts
@@ -346,7 +346,7 @@ export function degreePlannerReducer(
       const { yearCode: fromYearCode } = fromTermCode;
       const { yearCode: toYearCode } = toTermCode;
       const course = findCourse(state.visibleYears, fromTermCode, id);
-
+      this.course.classNumber = null;
       if (course && course.id !== null) {
         const fromYear = createYearWithoutCourse(
           fromTermCode,