diff --git a/doc/sof.doxygen.in b/doc/sof.doxygen.in
index 6379da500f11..a54481858b31 100644
--- a/doc/sof.doxygen.in
+++ b/doc/sof.doxygen.in
@@ -10,7 +10,8 @@ INPUT            = @top_srcdir@/src/include/ipc \
                    @top_srcdir@/src/include/kernel \
 		   @top_srcdir@/src/include/user \
                    @top_srcdir@/src/include/sof \
-                   @top_srcdir@/xtos/include
+                   @top_srcdir@/xtos/include \
+                   @top_srcdir@/zephyr/include
 # Exlude some 3rd party codec headers with external references
 EXCLUDE		 = @top_srcdir@/src/include/sof/audio/MaxxEffect
 RECURSIVE	 = YES