diff --git a/Makefile b/Makefile
index a8b3f9e3c51..3a9de881231 100644
--- a/Makefile
+++ b/Makefile
@@ -702,6 +702,8 @@ ifeq ($(uname_S),AIX)
 	INTERNAL_QSORT = UnfortunatelyYes
 	NEEDS_LIBICONV=YesPlease
 	BASIC_CFLAGS += -D_LARGE_FILES
+	COMPAT_CFLAGS += -Icompat/regex
+	COMPAT_OBJS += compat/regex/regex.o
 endif
 ifeq ($(uname_S),GNU)
 	# GNU/Hurd