diff --git a/CMakeLists.txt b/CMakeLists.txt
index 945dcadbe4..587e39d6df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -404,7 +404,7 @@ if(NOT MSVC)
 			add_definitions(-Wno-psabi)
 		endif()
 		add_definitions(-D_XOPEN_SOURCE=700)
-		add_definitions(-D_XOPEN_SOURCE_EXTENDED -D__BSD_VISIBLE=1)
+		add_definitions(-D_XOPEN_SOURCE_EXTENDED -D__BSD_VISIBLE=1 -D_BSD_SOURCE)
 		add_definitions(-D_LARGEFILE64_SOURCE=1 -D_FILE_OFFSET_BITS=64)
 	elseif(ANDROID)
 		add_definitions(-fsigned-char)