diff --git a/cockatrice/src/player.cpp b/cockatrice/src/player.cpp
index 276e8ebe..a44f6953 100644
--- a/cockatrice/src/player.cpp
+++ b/cockatrice/src/player.cpp
@@ -515,6 +515,7 @@ void Player::playerListActionTriggered()
     if (menu == mRevealLibrary) {
         cmd.set_zone_name("deck");
     } else if (menu == mRevealTopCard) {
+        int decksize = zones.value("deck")->getCards().size();
         bool ok;
         int number = 
 #if QT_VERSION < 0x050000
@@ -522,7 +523,7 @@ void Player::playerListActionTriggered()
 #else
             QInputDialog::getInt(
 #endif
-            0, tr("Reveal top cards of library"), tr("Number of cards:"), defaultNumberTopCards, 1, 2000000000, 1, &ok);
+            0, tr("Reveal top cards of library"), tr("Number of cards: (max %1)").arg(decksize), defaultNumberTopCards, 1, decksize, 1, &ok);
         if (ok) {
             cmd.set_zone_name("deck");
             cmd.set_top_cards(number);