diff --git a/Mk/defaults.mk b/Mk/defaults.mk
index 69c1125f2..b794cebfb 100644
--- a/Mk/defaults.mk
+++ b/Mk/defaults.mk
@@ -56,6 +56,8 @@ VERSIONBIN=	${LOCALBASE}/sbin/opnsense-version
 .if exists(${VERSIONBIN})
 _PLUGIN_ABI!=	${VERSIONBIN} -a
 PLUGIN_ABI?=	${_PLUGIN_ABI}
+.else
+PLUGIN_ABI?=	21.7
 .endif
 
 PHPBIN=		${LOCALBASE}/bin/php
@@ -72,9 +74,6 @@ _PLUGIN_PYTHON!=${PYTHONLINK} -V
 PLUGIN_PYTHON?=	${_PLUGIN_PYTHON:[2]:S/./ /g:[1..2]:tW:S/ //}
 .endif
 
-.if !empty(DEVABI)
-PLUGIN_ABI=	${DEVABI}
-.endif
 
 .for REPLACEMENT in ABI PHP PYTHON
 . if empty(PLUGIN_${REPLACEMENT})