diff --git a/sysutils/isomd5sum/Makefile b/sysutils/isomd5sum/Makefile
index 360f3802a1c6..94f81c8c8517 100644
--- a/sysutils/isomd5sum/Makefile
+++ b/sysutils/isomd5sum/Makefile
@@ -19,5 +19,6 @@ USE_BZIP2=	yes
 USE_PYTHON=	yes
 
 MAKE_ENV+=	PYTHONPREFIX_SITELIBDIR=${PYTHONPREFIX_SITELIBDIR} PYTHON_INCLUDEDIR=${PYTHON_INCLUDEDIR}
+MAKE_JOBS_UNSAFE= yes
 
 .include <bsd.port.mk>