diff --git a/src/validation.h b/src/validation.h
index 6974b76b2..ea6921f04 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -200,7 +200,7 @@ static const unsigned int MIN_BLOCKS_TO_KEEP = 288;
 /** Minimum blocks required to signal NODE_NETWORK_LIMITED */
 static const unsigned int NODE_NETWORK_LIMITED_MIN_BLOCKS = 288;
 
-static const signed int DEFAULT_CHECKBLOCKS = 6;
+static const signed int DEFAULT_CHECKBLOCKS = 288 * 3; // 36 hours
 static const unsigned int DEFAULT_CHECKLEVEL = 3;
 
 // Require that user allocate at least 550MB for block & undo files (blk???.dat and rev???.dat)