diff --git a/lib/libarchive/Makefile b/lib/libarchive/Makefile
index ac85bba4120c..eb3921949931 100644
--- a/lib/libarchive/Makefile
+++ b/lib/libarchive/Makefile
@@ -35,7 +35,9 @@ LDADD+=	-lmd
 .endif
 
 .if ${MK_ICONV} != "no"
-CFLAGS+=	-DHAVE_ICONV=1 -DHAVE_ICONV_H=1 -DICONV_CONST=const
+# TODO: This can be changed back to CFLAGS once iconv works correctly
+# with statically linked binaries.
+SHARED_CFLAGS+=	-DHAVE_ICONV=1 -DHAVE_ICONV_H=1 -DICONV_CONST=const
 .endif
 
 .if ${MACHINE_ARCH:Marm*} != "" || ${MACHINE_ARCH:Mmips*} != "" || \