diff --git a/helpers/make-debian-installer b/helpers/make-debian-installer
index c30245c9ff6a0597bfff56a85d486bb41caa1477..c18df1a8ef9aff37b824d3a1eb1a1707f5e2a984 100644
--- a/helpers/make-debian-installer
+++ b/helpers/make-debian-installer
@@ -23,7 +23,7 @@ NETINST=true
 
 find build/pkg-lists -type f | xargs sed -i /media-retriever/d
 
-LASTKERNEL=$(apt-cache showsrc linux-libc-dev|grep ^Version | tac |head -n1|cut -d" " -f2|cut -d. -f1,2,3)
+LASTKERNEL=$(apt-cache show linux-libc-dev|grep ^Version |head -n1|cut -d" " -f2|cut -d. -f1,2,3)
 /bin/sed -i "s/^BASEVERSION.*/BASEVERSION = $LASTKERNEL/g" ./build/config/i386.cfg ./build/config/amd64.cfg
 sed -i "s/^MEDIUM_SUPPORTED.*/MEDIUM_SUPPORTED = cdrom netboot/g" ./build/config/i386.cfg ./build/config/amd64.cfg
 sed -i "/signed/d" ./build/config/amd64.cfg