diff --git a/Makefile.inc1 b/Makefile.inc1
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -1827,6 +1827,12 @@
 #
 # Install the kernel defined by INSTALLKERNEL
 #
+.if defined(PACKAGE_BUILDING)
+_instkernel=${INSTALLKERNEL}.${INSTKERNNAME}
+.else
+_instkernel=${INSTKERNNAME}
+.endif
+
 installkernel installkernel.debug \
 reinstallkernel reinstallkernel.debug: _installcheck_kernel .PHONY
 .if !defined(NO_INSTALLKERNEL)
@@ -1839,9 +1845,9 @@
 	@echo "--------------------------------------------------------------"
 	${_+_}cd ${KRNLOBJDIR}/${INSTALLKERNEL}; \
 	    ${CROSSENV} PATH=${TMPPATH:Q} \
-	    ${MAKE} ${IMAKE_INSTALL} KERNEL=${INSTKERNNAME} ${.TARGET:S/kernel//}
+	    ${MAKE} ${IMAKE_INSTALL} KERNEL=${_instkernel} ${.TARGET:S/kernel//}
 	@echo "--------------------------------------------------------------"
-	@echo ">>> Installing kernel ${INSTALLKERNEL} completed on $$(LC_ALL=C date)"
+	@echo ">>> Installing kernel ${_instkernel} completed on $$(LC_ALL=C date)"
 	@echo "--------------------------------------------------------------"
 .endif
 .if ${BUILDKERNELS:[#]} > 1 && ${NO_INSTALLEXTRAKERNELS} != "yes"