diff --git a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt
index eea5463d1..c38ffd99f 100644
--- a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt
+++ b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TestTimetableEntityCreator.kt
@@ -7,7 +7,7 @@ import org.threeten.bp.LocalDateTime.now
 import io.github.wulkanowy.api.timetable.Timetable as TimetableRemote
 import io.github.wulkanowy.data.db.entities.Timetable as TimetableLocal
 
-fun createTimetableLocal(number: Int, start: LocalDateTime, room: String = "", subject: String = "", teacher: String = ""): TimetableLocal {
+fun createTimetableLocal(number: Int, start: LocalDateTime, room: String = "", subject: String = "", teacher: String = "", changes: Boolean = false): TimetableLocal {
     return TimetableLocal(
         studentId = 1,
         diaryId = 2,
@@ -23,12 +23,12 @@ fun createTimetableLocal(number: Int, start: LocalDateTime, room: String = "", s
         teacher = teacher,
         teacherOld = "",
         info = "",
-        changes = false,
+        changes = changes,
         canceled = false
     )
 }
 
-fun createTimetableRemote(number: Int, start: LocalDateTime, room: String, subject: String = "", teacher: String = ""): TimetableRemote {
+fun createTimetableRemote(number: Int, start: LocalDateTime, room: String, subject: String = "", teacher: String = "", changes: Boolean = false): TimetableRemote {
     return TimetableRemote(
         number = number,
         start = start.toDate(),
@@ -39,7 +39,7 @@ fun createTimetableRemote(number: Int, start: LocalDateTime, room: String, subje
         room = room,
         teacher = teacher,
         info = "",
-        changes = false,
+        changes = changes,
         canceled = false
     )
 }
diff --git a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt
index 79216d552..02ab605ed 100644
--- a/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt
+++ b/app/src/androidTest/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepositoryTest.kt
@@ -60,7 +60,7 @@ class TimetableRepositoryTest {
     }
 
     @Test
-    fun copyDetailsToCompletedFromPrevious() {
+    fun copyRoomToCompletedFromPrevious() {
         timetableLocal.saveTimetable(listOf(
             createTimetableLocal(1, of(2019, 3, 5, 8, 0), "123", "Przyroda"),
             createTimetableLocal(2, of(2019, 3, 5, 8, 50), "321", "Religia"),
@@ -83,7 +83,32 @@ class TimetableRepositoryTest {
         assertEquals("123", lessons[0].room)
         assertEquals("321", lessons[1].room)
         assertEquals("213", lessons[2].room)
+    }
 
-        assertEquals("", lessons[3].teacher)
+    @Test
+    fun copyTeacherToCompletedFromPrevious() {
+        timetableLocal.saveTimetable(listOf(
+            createTimetableLocal(1, of(2019, 3, 5, 8, 0), "123", "Przyroda", "Jan Garnkiewicz", false),
+            createTimetableLocal(2, of(2019, 3, 5, 8, 50), "321", "Religia", "Paweł Jumper", false),
+            createTimetableLocal(3, of(2019, 3, 5, 9, 40), "213", "W-F", "", true),
+            createTimetableLocal(4, of(2019, 3, 5, 10, 30), "213", "W-F", "", false)
+        ))
+
+        every { mockApi.getTimetable(any(), any()) } returns Single.just(listOf(
+            createTimetableRemote(1, of(2019, 3, 5, 8, 0), "", "Przyroda", "", true), // should override local
+            createTimetableRemote(2, of(2019, 3, 5, 8, 50), "", "Religia", "", false),
+            createTimetableRemote(3, of(2019, 3, 5, 9, 40), "", "W-F", "Jan Garnkiewicz", false),
+            createTimetableRemote(4, of(2019, 3, 5, 10, 30), "", "W-F", "Paweł Jumper", false)
+        ))
+
+        val lessons = TimetableRepository(settings, timetableLocal, timetableRemote)
+            .getTimetable(semesterMock, LocalDate.of(2019, 3, 5), LocalDate.of(2019, 3, 5), true)
+            .blockingGet()
+
+        assertEquals(4, lessons.size)
+        assertEquals("", lessons[0].teacher)
+        assertEquals("Paweł Jumper", lessons[1].teacher)
+        assertEquals("Jan Garnkiewicz", lessons[2].teacher)
+        assertEquals("Paweł Jumper", lessons[3].teacher)
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
index 0e6331f91..e10e958ec 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/timetable/TimetableRepository.kt
@@ -32,10 +32,11 @@ class TimetableRepository @Inject constructor(
                         .doOnSuccess { old ->
                             local.deleteTimetable(old.uniqueSubtract(new))
                             local.saveTimetable(new.uniqueSubtract(old).map { item ->
-                                item.apply {
-                                    old.singleOrNull { this.start == it.start }?.let {
-                                        return@map copy(
-                                            room = if (room.isEmpty()) it.room else room
+                                item.also { new ->
+                                    old.singleOrNull { new.start == it.start }?.let { old ->
+                                        return@map new.copy(
+                                            room = if (new.room.isEmpty()) old.room else new.room,
+                                            teacher = if (new.teacher.isEmpty() && !new.changes) old.teacher else new.teacher
                                         )
                                     }
                                 }