1 files changed, 1 insertions, 1 deletions
diff --git a/mk/os.mk b/mk/os.mk
index 7b395cd8..7993820b 100644
--- a/mk/os.mk
+++ b/mk/os.mk
@@ -13,7 +13,7 @@ _PREFIX_SH=	if test -n "${PREFIX}" && test "${PREFIX}" != "/"; then echo "-DPREF
 _PREFIX!=	${_PREFIX_SH}
 CFLAGS+=	${_PREFIX}$(shell ${_PREFIX_SH})
 
-_PKG_PREFIX_SH=	if test -n "${PKG_PREFIX}" && test "${PKG_PREFIX}" != "/"; then echo "-DPKG_PREFIX=\\\"${PKG_PREFIX}\\\""; else echo ""; fi
+_PKG_PREFIX_SH=	if test -n "${PKG_PREFIX}" && test "${PKG_PREFIX}" != "/" && test "${PKG_PREFIX}" != "${PREFIX}"; then echo "-DPKG_PREFIX=\\\"${PKG_PREFIX}\\\""; else echo ""; fi
 _PKG_PREFIX!=	${_PKG_PREFIX_SH}
 CFLAGS+=	${_PKG_PREFIX}$(shell ${_PKG_PREFIX_SH})