diff --git a/src/modules/attitude_estimator_q/attitude_estimator_q_main.cpp b/src/modules/attitude_estimator_q/attitude_estimator_q_main.cpp
index 138a8c7e5c..72b35d3b5f 100644
--- a/src/modules/attitude_estimator_q/attitude_estimator_q_main.cpp
+++ b/src/modules/attitude_estimator_q/attitude_estimator_q_main.cpp
@@ -40,6 +40,7 @@
  */
 
 #include <px4_config.h>
+#include <px4_posix.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>