diff --git a/src/main.h b/src/main.h
index 1d3ac1cdbb..cfbd0ea44a 100644
--- a/src/main.h
+++ b/src/main.h
@@ -35,10 +35,12 @@ class CInv;
 
 /** The maximum allowed size for a serialized block, in bytes (network rule) */
 static const unsigned int MAX_BLOCK_SIZE = 1000000;
-/** The maximum size for mined blocks */
-static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
+/** Default for -blockmaxsize, maximum size for mined blocks **/
+static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 750000;
+/** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
+static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 50000;
 /** The maximum size for transactions we're willing to relay/mine */
-static const unsigned int MAX_STANDARD_TX_SIZE = MAX_BLOCK_SIZE_GEN/5;
+static const unsigned int MAX_STANDARD_TX_SIZE = 100000;
 /** The maximum allowed number of signature check operations in a block (network rule) */
 static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
 /** The maximum number of orphan transactions kept in memory */
@@ -58,8 +60,6 @@ static const int COINBASE_MATURITY = 100;
 static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov  5 00:53:20 1985 UTC
 /** Maximum number of script-checking threads allowed */
 static const int MAX_SCRIPTCHECK_THREADS = 16;
-/** Default amount of block size reserved for high-priority transactions (in bytes) */
-static const int DEFAULT_BLOCK_PRIORITY_SIZE = 27000;
 #ifdef USE_UPNP
 static const int fHaveUPnP = true;
 #else
diff --git a/src/miner.cpp b/src/miner.cpp
index b01b60cc34..03acadac55 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -162,7 +162,7 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
     pblocktemplate->vTxSigOps.push_back(-1); // updated at end
 
     // Largest block you're willing to create:
-    unsigned int nBlockMaxSize = GetArg("-blockmaxsize", MAX_BLOCK_SIZE_GEN/2);
+    unsigned int nBlockMaxSize = GetArg("-blockmaxsize", DEFAULT_BLOCK_MAX_SIZE);
     // Limit to betweeen 1K and MAX_BLOCK_SIZE-1K for sanity:
     nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SIZE-1000), nBlockMaxSize));