diff --git a/bitcoin/src/blockdata/constants.rs b/bitcoin/src/blockdata/constants.rs
index 3ae56bb5..b3f9743f 100644
--- a/bitcoin/src/blockdata/constants.rs
+++ b/bitcoin/src/blockdata/constants.rs
@@ -54,6 +54,8 @@ pub const MAX_SCRIPT_ELEMENT_SIZE: usize = 520;
 pub const SUBSIDY_HALVING_INTERVAL: u32 = 210_000;
 /// Maximum allowed value for an integer in Script.
 pub const MAX_SCRIPTNUM_VALUE: u32 = 0x80000000; // 2^31
+/// Number of blocks needed for an output from a coinbase transaction to be spendable.
+pub const COINBASE_MATURITY: u32 = 100;
 
 /// The maximum value allowed in an output (useful for sanity checking,
 /// since keeping everything below this value should prevent overflows