diff --git a/src/c2pool/CMakeLists.txt b/src/c2pool/CMakeLists.txt
index 73984b14f..844092465 100644
--- a/src/c2pool/CMakeLists.txt
+++ b/src/c2pool/CMakeLists.txt
@@ -175,6 +175,7 @@ target_link_libraries(c2pool-btc
     ltc_coin  # ltc OBJECT lib pulls in protocol handlers needing ltc::coin::{Mutable,}Transaction ctors
     btc
     btc_stratum
+    nmc_coin   # NMC coin-layer: embedded merged-mining (2b-ii) — supplies nmc::coin Transaction/MutableTransaction ctors for the aux commitment path wired into main_btc
     nlohmann_json::nlohmann_json
     ${Boost_LIBRARIES}
 )