diff --git a/src/main.h b/src/main.h
index aaf0f794c..14513b730 100644
--- a/src/main.h
+++ b/src/main.h
@@ -49,6 +49,7 @@ class PrecomputedTransactionData;
 
 struct CNodeStateStats;
 #define DEFAULT_MEMPOOL_EXPIRY 1
+#define _COINBASE_MATURITY 100
 
 /** Default for -blockmaxsize and -blockminsize, which control the range of sizes the mining code will create **/
 static const unsigned int DEFAULT_BLOCK_MAX_SIZE = MAX_BLOCK_SIZE;