diff --git a/libs/libdsp/CMakeLists.txt b/libs/libdsp/CMakeLists.txt
index a1f21c0e08..ed6c135a40 100644
--- a/libs/libdsp/CMakeLists.txt
+++ b/libs/libdsp/CMakeLists.txt
@@ -24,6 +24,7 @@ if(CONFIG_LIBDSP)
     lib_svm.c
     lib_transform.c
     lib_observer.c
+    lib_observer_b16.c
     lib_foc.c
     lib_misc.c
     lib_motor.c