diff --git a/Makefile.am b/Makefile.am
index 65f09eb1a3..de6c9c190c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -139,7 +139,7 @@ endif
 
 
 libs/libedit/Makefile:
-	cd libs/libedit && ./configure --disable-shared --with-pic
+	cd libs/libedit && ./configure CFLAGS="-D_XOPEN_SOURCE=600 -D_BSD_SOURCE=1" --disable-shared --with-pic
 libs/libedit/src/.libs/libedit.a: libs/libedit/Makefile
 	cd libs/libedit && $(MAKE)