diff --git a/cockatrice/src/carddatabase.cpp b/cockatrice/src/carddatabase.cpp
index c500b379..17b18a8a 100644
--- a/cockatrice/src/carddatabase.cpp
+++ b/cockatrice/src/carddatabase.cpp
@@ -1129,6 +1129,8 @@ void CardDatabase::checkUnknownSets()
         return;
     }
 
+    detectedFirstRun = false;
+
     int numUnknownSets = sets.getUnknownSetsNum();
     // no unkown sets. 
     if(!numUnknownSets)