diff --git a/CMakeLists.txt b/CMakeLists.txt
index fca70e71f6..985ca6437a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,7 +38,7 @@ endif()
 px4_add_module(
 	MODULE lib__ecl
 	STACK_MAIN 6000
-	COMPILE_FLAGS ${MODULE_CFLAGS} -Os
+	COMPILE_FLAGS ${MODULE_CFLAGS}
 	SRCS
 		attitude_fw/ecl_controller.cpp
 		attitude_fw/ecl_pitch_controller.cpp
@@ -62,4 +62,4 @@ px4_add_module(
 	DEPENDS
 		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix : 
+# vim: set noet ft=cmake fenc=utf-8 ff=unix :
diff --git a/EKF/tests/base/CMakeLists.txt b/EKF/tests/base/CMakeLists.txt
index 8e4c206fd3..0ae930cdd5 100644
--- a/EKF/tests/base/CMakeLists.txt
+++ b/EKF/tests/base/CMakeLists.txt
@@ -35,10 +35,9 @@ px4_add_module(
 	MAIN base
 	STACK_MAIN 4096
 	COMPILE_FLAGS
-		-Os
 	SRCS
 		base.cpp
 	DEPENDS
 		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix : 
+# vim: set noet ft=cmake fenc=utf-8 ff=unix :
diff --git a/EKF/tests/ringbuffer/CMakeLists.txt b/EKF/tests/ringbuffer/CMakeLists.txt
index af191e0cfb..9658c4afc4 100644
--- a/EKF/tests/ringbuffer/CMakeLists.txt
+++ b/EKF/tests/ringbuffer/CMakeLists.txt
@@ -35,10 +35,9 @@ px4_add_module(
 	MAIN ringbuffer
 	STACK_MAIN 4096
 	COMPILE_FLAGS
-		-Os
 	SRCS
 		ringbuffer.cpp
 	DEPENDS
 		platforms__common
 	)
-# vim: set noet ft=cmake fenc=utf-8 ff=unix : 
+# vim: set noet ft=cmake fenc=utf-8 ff=unix :