diff --git a/boards/aerotenna/ocpoc/default.cmake b/boards/aerotenna/ocpoc/default.cmake
index b5a8a1c4fe..08fa7f8cca 100644
--- a/boards/aerotenna/ocpoc/default.cmake
+++ b/boards/aerotenna/ocpoc/default.cmake
@@ -1,3 +1,6 @@
+add_definitions(
+	-D__PX4_LINUX
+)
 
 px4_add_board(
 	VENDOR aerotenna
diff --git a/boards/beaglebone/blue/default.cmake b/boards/beaglebone/blue/default.cmake
index 712bf3264e..e6d70ef25f 100644
--- a/boards/beaglebone/blue/default.cmake
+++ b/boards/beaglebone/blue/default.cmake
@@ -1,3 +1,8 @@
+add_definitions(
+	-D__PX4_LINUX
+
+	-DRC_AUTOPILOT_EXT  # Enable extensions in Robotics Cape Library, TODO: remove
+)
 
 px4_add_board(
 	VENDOR beaglebone
diff --git a/boards/emlid/navio2/default.cmake b/boards/emlid/navio2/default.cmake
index ff7ce0af1c..0659dc979a 100644
--- a/boards/emlid/navio2/default.cmake
+++ b/boards/emlid/navio2/default.cmake
@@ -1,3 +1,6 @@
+add_definitions(
+	-D__PX4_LINUX
+)
 
 px4_add_board(
 	VENDOR emlid
diff --git a/boards/px4/raspberrypi/default.cmake b/boards/px4/raspberrypi/default.cmake
index c71370a53b..64f5d34c0d 100644
--- a/boards/px4/raspberrypi/default.cmake
+++ b/boards/px4/raspberrypi/default.cmake
@@ -1,3 +1,6 @@
+add_definitions(
+	-D__PX4_LINUX
+)
 
 px4_add_board(
 	VENDOR px4
diff --git a/platforms/posix/cmake/px4_impl_os.cmake b/platforms/posix/cmake/px4_impl_os.cmake
index eac23a788e..3d9bada3c1 100644
--- a/platforms/posix/cmake/px4_impl_os.cmake
+++ b/platforms/posix/cmake/px4_impl_os.cmake
@@ -251,22 +251,6 @@ function(px4_os_add_flags)
 			add_definitions(-D__PX4_LINUX)
 		endif()
 
-	elseif (("${PX4_BOARD}" MATCHES "navio2") OR ("${PX4_BOARD}" MATCHES "raspberrypi"))
-		#TODO: move to board support
-		add_definitions(-D__PX4_LINUX)
-
-	elseif ("${PX4_BOARD}" MATCHES "aerotenna_ocpoc")
-		#TODO: move to board support
-		add_definitions(-D__PX4_LINUX)
-
-	elseif ("${PX4_BOARD}" MATCHES "beaglebone_blue")
-		#TODO: move to board support
-		add_definitions(
-			-D__PX4_LINUX
-
-			-DRC_AUTOPILOT_EXT  # Enable extensions in Robotics Cape Library, TODO: remove
-		)
-
 	endif()
 
 endfunction()