diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5db727..5e60a17 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,8 @@ if ("${CMAKE_SYSTEM_NAME}" MATCHES "BSD")
 	# Need this for SIGWINCH in FreeBSD and OpenBSD respectively;
 	# our POSIX version macros make it undefined
 	add_definitions (-D__BSD_VISIBLE=1 -D_BSD_SOURCE=1)
+elseif (APPLE)
+	add_definitions (-D_DARWIN_C_SOURCE)
 endif ()
 
 include (CheckFunctionExists)
diff --git a/nncmpp.c b/nncmpp.c
index 2f47053..2ae493d 100644
--- a/nncmpp.c
+++ b/nncmpp.c
@@ -78,9 +78,7 @@ enum
 #include <math.h>
 #include <locale.h>
 #include <termios.h>
-#ifndef TIOCGWINSZ
 #include <sys/ioctl.h>
-#endif  // ! TIOCGWINSZ
 
 // ncurses is notoriously retarded for input handling, we need something
 // different if only to receive mouse events reliably.