diff --git a/lib/libiconv_modules/Makefile b/lib/libiconv_modules/Makefile
index 2bb09da7253..1a7213612b8 100644
--- a/lib/libiconv_modules/Makefile
+++ b/lib/libiconv_modules/Makefile
@@ -2,9 +2,6 @@
 
 .include <bsd.own.mk>
 
-CFLAGS+=	-Dbool=_Bool
-.export CFLAGS
-
 SUBDIR=	BIG5 DECHanyu EUC EUCTW GBK2K HZ ISO2022 JOHAB MSKanji UES UTF1632 \
 	UTF7 UTF8 VIQR ZW iconv_none iconv_std mapper_646 mapper_none \
 	mapper_parallel mapper_serial mapper_std mapper_zone
diff --git a/lib/libiconv_modules/Makefile.inc b/lib/libiconv_modules/Makefile.inc
index 994939008ab..3b25374b91e 100644
--- a/lib/libiconv_modules/Makefile.inc
+++ b/lib/libiconv_modules/Makefile.inc
@@ -5,6 +5,9 @@
 SHLIB_MAJOR= 4
 WARNS?=	6
 CFLAGS+= -I${.CURDIR}/../../libc/iconv
+
+CFLAGS+=	-Dbool=_Bool
+
 .if !defined(COMPAT_32BIT)
 SHLIBDIR= /usr/lib/i18n
 .else