diff --git a/Makefile.am b/Makefile.am
index afd05d2..fef9458 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -17,7 +17,7 @@ cava_CPPFLAGS = -DPACKAGE=\"$(PACKAGE)\" -DVERSION=\"$(VERSION)\" \
 cava_CFLAGS = -std=c99 -Wall -Werror -Wextra -Wno-unused-result -Wno-unknown-warning-option -Wno-maybe-uninitialized
 
 if OSX
-    cava_CFLAGS += -DNORT -D_XOPEN_SOURCE_EXTENDED
+    cava_CFLAGS += -DNORT
 else
     cava_LDFLAGS += -lrt
 endif
diff --git a/output/terminal_bcircle.c b/output/terminal_bcircle.c
index 90363cb..31799e6 100644
--- a/output/terminal_bcircle.c
+++ b/output/terminal_bcircle.c
@@ -1,5 +1,6 @@
 #include "output/terminal_bcircle.h"
 
+#define _XOPEN_SOURCE_EXTENDED
 #include <curses.h>
 #include <locale.h>
 #include <math.h>