diff --git a/external/bsd/pkg_install/Makefile.inc b/external/bsd/pkg_install/Makefile.inc
index fbbd7d3a3..d7247cdbd 100644
--- a/external/bsd/pkg_install/Makefile.inc
+++ b/external/bsd/pkg_install/Makefile.inc
@@ -12,6 +12,7 @@ CPPFLAGS+=-DSYSCONFDIR='"/etc"'
 .else
 CPPFLAGS+=-DSYSCONFDIR='"/usr/pkg/etc"'
 CPPFLAGS+=-DDEF_LOG_DIR='"/usr/pkg/var/db/pkg"'
+CPPFLAGS+=-DOPSYS_NAME='"Minix"'
 .endif # !defined(__MINIX)
 
 WARNS=	4