diff --git a/security/clamav/Makefile b/security/clamav/Makefile
index 83841129e985e..f1ef30e0ae53c 100644
--- a/security/clamav/Makefile
+++ b/security/clamav/Makefile
@@ -81,8 +81,8 @@ TESTS_CMAKE_BOOL=		ENABLE_TESTS
 UNRAR_CMAKE_BOOL=		ENABLE_UNRAR
 UNZOO_RUN_DEPENDS=		unzoo:archivers/unzoo
 
-_CLAMAVUSER=	clamav
-_CLAMAVGROUP=	clamav
+_CLAMAVUSER?=	clamav
+_CLAMAVGROUP?=	clamav
 
 _CLAMAV_CLAMD_SOCKET?=	${_RUNDIR}/clamd.sock
 _CLAMAV_CLAMD_PIDFILE?=	${_RUNDIR}/clamd.pid