diff --git a/src/ipc/CMakeLists.txt b/src/ipc/CMakeLists.txt
index 1859baa7a3ee..8fc26acb7e3f 100644
--- a/src/ipc/CMakeLists.txt
+++ b/src/ipc/CMakeLists.txt
@@ -6,7 +6,8 @@ elseif (CONFIG_IPC_MAJOR_4)
         add_subdirectory(ipc4)
 endif()
 
-set(base_files
+# Common to Zephyr and XTOS
+add_local_sources(sof
 	ipc-common.c
 	ipc-helper.c
 )
@@ -15,7 +16,6 @@ is_zephyr(it_is)
 if(it_is) ###  Zephyr ###
 
 zephyr_library_sources(
-	${base_files}
 	dma-copy.c
 )
 
@@ -29,10 +29,6 @@ endif()
 else() ###  Not Zephyr ###
 
 
-add_local_sources(sof
-	${base_files}
-)
-
 if (CONFIG_TRACE)
 	add_local_sources(sof
 		dma-copy.c)
diff --git a/src/ipc/ipc3/CMakeLists.txt b/src/ipc/ipc3/CMakeLists.txt
index eb791d1836a6..db1e6825085c 100644
--- a/src/ipc/ipc3/CMakeLists.txt
+++ b/src/ipc/ipc3/CMakeLists.txt
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
-set(common_files
+# Files common to Zephyr and XTOS
+add_local_sources(sof
 		handler.c
 		helper.c
 		dai.c
@@ -10,16 +11,11 @@ is_zephyr(it_is)
 if(it_is) ###  Zephyr ###
 
 zephyr_library_sources(
-	${common_files}
 	host-page-table.c
 )
 
 else()  ### Not Zephyr ###
 
-add_local_sources(sof
-	${common_files}
-)
-
 if (CONFIG_HOST_PTABLE)
 	add_local_sources(sof
 		host-page-table.c)
diff --git a/src/ipc/ipc4/CMakeLists.txt b/src/ipc/ipc4/CMakeLists.txt
index c977d498619a..5a4d271e7f13 100644
--- a/src/ipc/ipc4/CMakeLists.txt
+++ b/src/ipc/ipc4/CMakeLists.txt
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
-set(common_files
+# Files common to Zephyr and XTOS
+add_local_sources(sof
 	dai.c
 	handler.c
 	helper.c
@@ -12,11 +13,6 @@ set(common_files
 is_zephyr(it_is)
 if(it_is) ###  Zephyr ###
 
-
-zephyr_library_sources(
-	${common_files}
-)
-
 zephyr_library_sources_ifdef(CONFIG_AMS
 	ams_helpers.c
 )
@@ -26,7 +22,6 @@ else()  ### Not Zephyr ####
 
 
 add_local_sources(sof
-	${common_files}
 	ams_helpers.c
 )