diff --git a/src/drivers/ocpoc_mmap_pwm_out/CMakeLists.txt b/src/drivers/ocpoc_mmap_pwm_out/CMakeLists.txt
index d8fa9c5bbc..337efccf32 100644
--- a/src/drivers/ocpoc_mmap_pwm_out/CMakeLists.txt
+++ b/src/drivers/ocpoc_mmap_pwm_out/CMakeLists.txt
@@ -33,7 +33,7 @@
 px4_add_module(
 	MODULE drivers__ocpoc_mmap_pwm_out
 	MAIN ocpoc_mmap_pwm_out
-	COMPILE_FLAGS -Os
+	COMPILE_FLAGS
 	SRCS
 		ocpoc_mmap_pwm_out.cpp
 	DEPENDS
diff --git a/src/drivers/ocpoc_sbus_rc_in/CMakeLists.txt b/src/drivers/ocpoc_sbus_rc_in/CMakeLists.txt
index 49e0590602..29ab2e63a5 100644
--- a/src/drivers/ocpoc_sbus_rc_in/CMakeLists.txt
+++ b/src/drivers/ocpoc_sbus_rc_in/CMakeLists.txt
@@ -34,7 +34,7 @@ px4_add_module(
 	MODULE drivers__ocpoc_sbus_rc_in
 	MAIN ocpoc_sbus_rc_in
 	STACK_MAIN 1200
-	COMPILE_FLAGS -Os
+	COMPILE_FLAGS
 	SRCS
 		ocpoc_sbus_rc_in.cpp
 	DEPENDS