diff --git a/app/src/main/java/chess/controller/commands/PromoteCommand.java b/app/src/main/java/chess/controller/commands/PromoteCommand.java
index 3adb4c4..c3e51da 100644
--- a/app/src/main/java/chess/controller/commands/PromoteCommand.java
+++ b/app/src/main/java/chess/controller/commands/PromoteCommand.java
@@ -57,6 +57,9 @@ public class PromoteCommand extends PlayerCommand {
 
 		outputSystem.onPawnPromoted(this.promoteType);
 
+		// invalidate the last move cache
+		board.setLastMove(null);
+
 		return CommandResult.Moved;
 	}