diff --git a/src/main.h b/src/main.h
index 9af58618..827aeabb 100644
--- a/src/main.h
+++ b/src/main.h
@@ -25,7 +25,7 @@ class CNode;
 struct CBlockIndexWorkComparator;
 
 /** The maximum allowed size for a serialized block, in bytes (network rule) */
-static const unsigned int MAX_BLOCK_SIZE = 1000000;
+static const unsigned int MAX_BLOCK_SIZE = 50000;
 /** The maximum size for mined blocks */
 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
 /** The maximum size for transactions we're willing to relay/mine */