diff --git a/platform/execution-impl/src/com/intellij/terminal/session/TerminalOutputEvent.kt b/platform/execution-impl/src/com/intellij/terminal/session/TerminalOutputEvent.kt
index c2815b32aeee..c85596c14c95 100644
--- a/platform/execution-impl/src/com/intellij/terminal/session/TerminalOutputEvent.kt
+++ b/platform/execution-impl/src/com/intellij/terminal/session/TerminalOutputEvent.kt
@@ -6,6 +6,7 @@ import com.intellij.terminal.session.dto.TerminalBlocksModelStateDto
 import com.intellij.terminal.session.dto.TerminalOutputModelStateDto
 import com.intellij.terminal.session.dto.TerminalStateDto
 import kotlinx.serialization.Serializable
+import kotlinx.serialization.Transient
 import org.jetbrains.annotations.ApiStatus
 import kotlin.time.TimeMark
 
@@ -20,7 +21,9 @@ data class TerminalContentUpdatedEvent(
   val text: String,
   val styles: List<StyleRangeDto>,
   val startLineLogicalIndex: Long,
-  val readTime: TimeMark?,
+  /** This value is used only on Backend. It is always null on the Frontend. */
+  @Transient
+  val readTime: TimeMark? = null,
 ) : TerminalOutputEvent
 
 @ApiStatus.Internal