diff --git a/base_layer/core/src/consensus/consensus_constants.rs b/base_layer/core/src/consensus/consensus_constants.rs
index c35ff0e28f..02b558dac8 100644
--- a/base_layer/core/src/consensus/consensus_constants.rs
+++ b/base_layer/core/src/consensus/consensus_constants.rs
@@ -210,15 +210,17 @@ impl ConsensusConstants {
     }
 
     /// Maximum transaction weight used for the construction of new blocks. It leaves place for 1 kernel and 1 output
-    /// with default features
+    /// with default features, as well as the maximum possible value of the `coinbase_extra` field
     pub fn get_max_block_weight_excluding_coinbase(&self) -> u64 {
         self.max_block_transaction_weight - self.calculate_1_output_kernel_weight()
     }
 
     fn calculate_1_output_kernel_weight(&self) -> u64 {
         let output_features = OutputFeatures { ..Default::default() };
+        let max_extra_size = self.coinbase_output_features_extra_max_length() as usize;
+
         let features_and_scripts_size = self.transaction_weight.round_up_features_and_scripts_size(
-            output_features.get_serialized_size() + script![Nop].get_serialized_size(),
+            output_features.get_serialized_size() + max_extra_size + script![Nop].get_serialized_size(),
         );
         self.transaction_weight.calculate(1, 0, 1, features_and_scripts_size)
     }