diff --git a/src/main.h b/src/main.h
index dd6989865..25ca5e2e8 100644
--- a/src/main.h
+++ b/src/main.h
@@ -31,7 +31,7 @@ static const unsigned int MAX_BLOCK_SIZE = 1000000;                      // 1000
 /** Obsolete: maximum size for mined blocks */
 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;         // 500KB  block soft limit
 /** Default for -blockmaxsize, maximum size for mined blocks **/
-static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 250000;
+static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 500000;
 /** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
 static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 17000;
 /** The maximum size for transactions we're willing to relay/mine */