diff --git a/builder/dockerfile.ubuntu1804.deb.test b/builder/dockerfile.ubuntu1804.deb.test
index 4172490..c436631 100644
--- a/builder/dockerfile.ubuntu1804.deb.test
+++ b/builder/dockerfile.ubuntu1804.deb.test
@@ -40,7 +40,8 @@ COPY startup/ $STARTUPDIR
 
 ### START CUSTOM STUFF ####
 
-COPY build/*.deb /tmp
+ARG KASMVNC_PACKAGE_DIR
+COPY $KASMVNC_PACKAGE_DIR/*.deb /tmp
 RUN dpkg -i /tmp/*.deb; apt-get -yf install
 
 ### END CUSTOM STUFF ###
diff --git a/builder/dockerfile.ubuntu2004.deb.test b/builder/dockerfile.ubuntu2004.deb.test
index 2a60b88..c5e5632 100644
--- a/builder/dockerfile.ubuntu2004.deb.test
+++ b/builder/dockerfile.ubuntu2004.deb.test
@@ -40,7 +40,8 @@ COPY startup/ $STARTUPDIR
 
 ### START CUSTOM STUFF ####
 
-COPY build/*.deb /tmp
+ARG KASMVNC_PACKAGE_DIR
+COPY $KASMVNC_PACKAGE_DIR/*.deb /tmp
 RUN dpkg -i /tmp/*.deb; apt-get -yf install
 
 ### END CUSTOM STUFF ###
diff --git a/builder/test-deb b/builder/test-deb
index 582fe69..11d1eac 100755
--- a/builder/test-deb
+++ b/builder/test-deb
@@ -5,6 +5,7 @@ set -e
 cd "$(dirname "$0")"
 . ./os_ver_cli.sh
 
-docker build -t kasmvnctester-deb:$os_ver \
+docker build --build-arg KASMVNC_PACKAGE_DIR="build/${os}_${os_ver}" \
+  -t kasmvnctester-deb:$os_ver \
   -f dockerfile.${os}${os_ver_dockerfile}.deb.test .
 #docker run -it -p 443:8443 --rm -e "VNC_USER=username" -e "VNC_PW=password123" kasmvnctester-deb:18.04