diff --git a/src/modules/ekf_att_pos_estimator/CMakeLists.txt b/src/modules/ekf_att_pos_estimator/CMakeLists.txt
index fc7fefd2bf..13eaeb6d2b 100644
--- a/src/modules/ekf_att_pos_estimator/CMakeLists.txt
+++ b/src/modules/ekf_att_pos_estimator/CMakeLists.txt
@@ -32,7 +32,7 @@
 ############################################################################
 
 set(MODULE_CFLAGS )
-if(NOT ${OS} STREQUAL "qurt")
+if(${OS} STREQUAL "nuttx")
 	list(APPEND MODULE_CFLAGS -Wframe-larger-than=3400)
 endif()