diff --git a/CMakeLists.txt b/CMakeLists.txt
index aba6e51259..453a2edcaf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,6 +60,7 @@ option(SECP256K1_ENABLE_MODULE_ECDH "Enable ECDH module." ON)
 option(SECP256K1_ENABLE_MODULE_RECOVERY "Enable ECDSA pubkey recovery module." OFF)
 option(SECP256K1_ENABLE_MODULE_EXTRAKEYS "Enable extrakeys module." ON)
 option(SECP256K1_ENABLE_MODULE_SCHNORRSIG "Enable schnorrsig module." ON)
+option(SECP256K1_ENABLE_MODULE_SCHNORRSIG_HALFAGG "Enable schnorrsig half-aggregation module." OFF)
 option(SECP256K1_ENABLE_MODULE_MUSIG "Enable musig module." ON)
 option(SECP256K1_ENABLE_MODULE_ELLSWIFT "Enable ElligatorSwift module." ON)
 
@@ -69,6 +70,18 @@ if(SECP256K1_ENABLE_MODULE_ELLSWIFT)
   add_compile_definitions(ENABLE_MODULE_ELLSWIFT=1)
 endif()
 
+option(SECP256K1_EXPERIMENTAL "Allow experimental configuration options." OFF)
+if(SECP256K1_ENABLE_MODULE_SCHNORRSIG_HALFAGG)
+  if(NOT SECP256K1_EXPERIMENTAL)
+    message(FATAL_ERROR "Schnorrsig half-aggregation is experimental. Use -DSECP256K1_EXPERIMENTAL=ON to allow.")
+  endif()
+  if(DEFINED SECP256K1_ENABLE_MODULE_SCHNORRSIG AND NOT SECP256K1_ENABLE_MODULE_SCHNORRSIG)
+    message(FATAL_ERROR "Module dependency error: You have disabled the schnorrsig module explicitly, but it is required by the Schnorrsig half-aggregation module.")
+  endif()
+  set(SECP256K1_ENABLE_MODULE_SCHNORRSIG ON)
+  add_compile_definitions(ENABLE_MODULE_SCHNORRSIG_HALFAGG=1)
+endif()
+
 if(SECP256K1_ENABLE_MODULE_MUSIG)
   if(DEFINED SECP256K1_ENABLE_MODULE_SCHNORRSIG AND NOT SECP256K1_ENABLE_MODULE_SCHNORRSIG)
     message(FATAL_ERROR "Module dependency error: You have disabled the schnorrsig module explicitly, but it is required by the musig module.")
@@ -156,7 +169,6 @@ elseif(SECP256K1_ASM)
   endif()
 endif()
 
-option(SECP256K1_EXPERIMENTAL "Allow experimental configuration options." OFF)
 if(NOT SECP256K1_EXPERIMENTAL)
   if(SECP256K1_ASM STREQUAL "arm32")
     message(FATAL_ERROR "ARM32 assembly is experimental. Use -DSECP256K1_EXPERIMENTAL=ON to allow.")
@@ -325,6 +337,7 @@ message("  ECDH ................................ ${SECP256K1_ENABLE_MODULE_ECDH}
 message("  ECDSA pubkey recovery ............... ${SECP256K1_ENABLE_MODULE_RECOVERY}")
 message("  extrakeys ........................... ${SECP256K1_ENABLE_MODULE_EXTRAKEYS}")
 message("  schnorrsig .......................... ${SECP256K1_ENABLE_MODULE_SCHNORRSIG}")
+message("  schnorrsig halfagg .................. ${SECP256K1_ENABLE_MODULE_SCHNORRSIG_HALFAGG}")
 message("  musig ............................... ${SECP256K1_ENABLE_MODULE_MUSIG}")
 message("  ElligatorSwift ...................... ${SECP256K1_ENABLE_MODULE_ELLSWIFT}")
 message("Parameters:")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f31b8c8f55..a20b16ca39 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -132,6 +132,9 @@ if(SECP256K1_INSTALL)
   if(SECP256K1_ENABLE_MODULE_SCHNORRSIG)
     list(APPEND ${PROJECT_NAME}_headers "${PROJECT_SOURCE_DIR}/include/secp256k1_schnorrsig.h")
   endif()
+  if(SECP256K1_ENABLE_MODULE_SCHNORRSIG_HALFAGG)
+    list(APPEND ${PROJECT_NAME}_headers "${PROJECT_SOURCE_DIR}/include/secp256k1_schnorrsig_halfagg.h")
+  endif()
   if(SECP256K1_ENABLE_MODULE_MUSIG)
     list(APPEND ${PROJECT_NAME}_headers "${PROJECT_SOURCE_DIR}/include/secp256k1_musig.h")
   endif()