diff --git a/src/audio/mixer/mixer.c b/src/audio/mixer/mixer.c
index fce964f4da1b..1fe9c381c142 100644
--- a/src/audio/mixer/mixer.c
+++ b/src/audio/mixer/mixer.c
@@ -9,7 +9,6 @@
 #include <sof/audio/component.h>
 #include <sof/audio/format.h>
 #include <sof/audio/module_adapter/module/generic.h>
-#include <sof/audio/mixer.h>
 #include <sof/audio/pipeline.h>
 #include <sof/audio/ipc-config.h>
 #include <sof/common.h>
@@ -32,6 +31,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "mixer.h"
+
 LOG_MODULE_REGISTER(mixer, CONFIG_SOF_LOG_LEVEL);
 
 /* bc06c037-12aa-417c-9a97-89282e321a76 */
diff --git a/src/include/sof/audio/mixer.h b/src/audio/mixer/mixer.h
similarity index 100%
rename from src/include/sof/audio/mixer.h
rename to src/audio/mixer/mixer.h
diff --git a/src/audio/mixer/mixer_generic.c b/src/audio/mixer/mixer_generic.c
index 0deabe2093a7..2b1b50501187 100644
--- a/src/audio/mixer/mixer_generic.c
+++ b/src/audio/mixer/mixer_generic.c
@@ -4,9 +4,10 @@
 //
 // Author: Andrula Song <xiaoyuan.song@intel.com>
 
-#include <sof/audio/mixer.h>
 #include <sof/common.h>
 
+#include "mixer.h"
+
 #ifdef MIXER_GENERIC
 
 #if CONFIG_FORMAT_S16LE
diff --git a/src/audio/mixer/mixer_hifi3.c b/src/audio/mixer/mixer_hifi3.c
index 2bba6c213df6..0d774208655e 100644
--- a/src/audio/mixer/mixer_hifi3.c
+++ b/src/audio/mixer/mixer_hifi3.c
@@ -4,9 +4,10 @@
 //
 // Author: Andrula Song <xiaoyuan.song@intel.com>
 
-#include <sof/audio/mixer.h>
 #include <sof/common.h>
 
+#include "mixer.h"
+
 #if __XCC__ && (XCHAL_HAVE_HIFI3 || XCHAL_HAVE_HIFI4)
 
 #include <xtensa/tie/xt_hifi3.h>
diff --git a/src/audio/mixin_mixout/mixin_mixout.c b/src/audio/mixin_mixout/mixin_mixout.c
index 0847007bfa40..8d0f96869fcb 100644
--- a/src/audio/mixin_mixout/mixin_mixout.c
+++ b/src/audio/mixin_mixout/mixin_mixout.c
@@ -6,7 +6,6 @@
 #include <sof/audio/component.h>
 #include <sof/audio/format.h>
 #include <sof/audio/module_adapter/module/generic.h>
-#include <sof/audio/mixer.h>
 #include <sof/audio/pipeline.h>
 #include <sof/audio/ipc-config.h>
 #include <sof/common.h>
diff --git a/test/cmocka/src/audio/mixer/CMakeLists.txt b/test/cmocka/src/audio/mixer/CMakeLists.txt
index a16016f70044..8b8147ed769e 100644
--- a/test/cmocka/src/audio/mixer/CMakeLists.txt
+++ b/test/cmocka/src/audio/mixer/CMakeLists.txt
@@ -28,4 +28,6 @@ cmocka_test(mixer
 	${PROJECT_SOURCE_DIR}/src/module/audio/sink_api.c
 	${PROJECT_SOURCE_DIR}/src/math/numbers.c
 )
+
+target_include_directories(mixer PRIVATE ${PROJECT_SOURCE_DIR}/src/audio)
 target_link_libraries(mixer PRIVATE -lm)
diff --git a/test/cmocka/src/audio/mixer/mixer_test.c b/test/cmocka/src/audio/mixer/mixer_test.c
index 8a4a3c938598..bf6a7ad6b48d 100644
--- a/test/cmocka/src/audio/mixer/mixer_test.c
+++ b/test/cmocka/src/audio/mixer/mixer_test.c
@@ -18,8 +18,9 @@
 #include <sof/audio/buffer.h>
 #include <sof/audio/component.h>
 #include <sof/audio/format.h>
-#include <sof/audio/mixer.h>
 #include <sof/audio/module_adapter/module/generic.h>
+
+#include "mixer/mixer.h"
 #include "../module_adapter.h"
 
 #ifdef HAVE_MALLOC_H