diff --git a/assets/linux.Dockerfile b/assets/linux.Dockerfile
index cbe751e..cffef1d 100644
--- a/assets/linux.Dockerfile
+++ b/assets/linux.Dockerfile
@@ -14,7 +14,7 @@ ENV TZ=Europe/Amsterdam
 
 
 # dependencies needed to run ./mach bootstrap
-RUN ( apt-get -y update && apt-get -y upgrade && apt-get -y install python3 python3-dev python3-pip wget dpkg-sig ; true)
+RUN ( apt-get -y update && apt-get -y upgrade && apt-get -y install python3 python3-dev python3-pip wget ; apt-get -y install dpkg-sig; true)
 RUN ( dnf -y upgrade && dnf -y install python3 python3-devel gcc wget rpm-build rpm-sign ; true)
 RUN ( zypper -n in mercurial python3 python3-pip python3-devel wget rpm-build ; true)
 
diff --git a/assets/linux.build-deb.sh b/assets/linux.build-deb.sh
index 84aeefc..c7add3f 100755
--- a/assets/linux.build-deb.sh
+++ b/assets/linux.build-deb.sh
@@ -47,8 +47,8 @@ cp -v ../librewolf.desktop usr/share/applications/librewolf.desktop
 cd ..
 dpkg-deb --build librewolf
 
-# Sign the deb file if private key is provided
-if [[ -f pk.asc ]]; then
+# Sign the deb file if private key is provided and we have dpkg-sig available
+if [[ -f pk.asc ]] && command -v dpkg-sig &>/dev/null; then
   gpg --import pk.asc
   dpkg-sig --sign builder librewolf.deb
 fi