diff --git a/Makefile b/Makefile
index bde53c971..dd121c053 100644
--- a/Makefile
+++ b/Makefile
@@ -41,20 +41,24 @@ CORE_TYPE?=	development
 .endfor
 
 _CORE_NEXT=	${CORE_ABI:C/\./ /}
-.if ${_CORE_NEXT:[2]} == 7
+.if ${_CORE_NEXT:[2]} == 7 # community
 CORE_NEXT!=	expr ${_CORE_NEXT:[1]} + 1
 CORE_NEXT:=	${CORE_NEXT}.1
-.elif ${_CORE_NEXT:[2]} == 10
+CORE_ALTABI?=	${CORE_ABI}
+.elif ${_CORE_NEXT:[2]} == 10 # business
 CORE_NEXT!=	expr ${_CORE_NEXT:[1]} + 1
 CORE_NEXT:=	${CORE_NEXT}.4
-.elif ${_CORE_NEXT:[2]} == 1
+CORE_ALTABI?=	${_CORE_NEXT:[1]}.7
+.elif ${_CORE_NEXT:[2]} == 1 # community
 CORE_NEXT=	${_CORE_NEXT:[1]}
 CORE_NEXT:=	${CORE_NEXT}.7
-.elif ${_CORE_NEXT:[2]} == 4
+CORE_ALTABI?=	${CORE_ABI}
+.elif ${_CORE_NEXT:[2]} == 4 # business
 CORE_NEXT=	${_CORE_NEXT:[1]}
 CORE_NEXT:=	${CORE_NEXT}.10
+CORE_ALTABI?=	${_CORE_NEXT:[1]}.1
 .else
-.error Unknown ABI minor version: ${_CORE_NEXT:[2]}
+.error Unsupported minor version for CORE_ABI=${CORE_ABI}
 .endif
 
 .if exists(${GIT}) && exists(${GITVERSION}) && exists(${.CURDIR}/.git)
diff --git a/Mk/defaults.mk b/Mk/defaults.mk
index 9c4e1190e..480808e1e 100644
--- a/Mk/defaults.mk
+++ b/Mk/defaults.mk
@@ -76,6 +76,7 @@ CORE_SYSLOGNG?=  ${_CORE_SYSLOGNG:S/./ /g:[1..2]:tW:S/ /./g}
 .endif
 
 REPLACEMENTS=	CORE_ABI \
+		CORE_ALTABI \
 		CORE_ARCH \
 		CORE_COMMIT \
 		CORE_COPYRIGHT_HOLDER \
diff --git a/src/opnsense/version/core.in b/src/opnsense/version/core.in
index e7aa1b5c9..2ce7bf159 100644
--- a/src/opnsense/version/core.in
+++ b/src/opnsense/version/core.in
@@ -1,5 +1,6 @@
 {
     "product_abi": "%%CORE_ABI%%",
+    "product_altabi": "%%CORE_ALTABI%%",
     "product_arch": "%%CORE_ARCH%%",
     "product_copyright_owner": "%%CORE_COPYRIGHT_HOLDER%%",
     "product_copyright_url": "%%CORE_COPYRIGHT_WWW%%",