diff --git a/docker/Dockerfile_debian_10 b/docker/Dockerfile_debian_10
index 561c27bdb786d0ab1a9b45eab7ee8619a6604fa8..558458dd8630924a592ad5227396e5096f4df045 100644
--- a/docker/Dockerfile_debian_10
+++ b/docker/Dockerfile_debian_10
@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control
diff --git a/docker/Dockerfile_debian_11 b/docker/Dockerfile_debian_11
index 8f6ba719463dc833ec2518f324ed973a8d421d8d..2169be2c718b67ca8c2c54ff01866eace85be7af 100644
--- a/docker/Dockerfile_debian_11
+++ b/docker/Dockerfile_debian_11
@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control
diff --git a/docker/Dockerfile_debian_testing b/docker/Dockerfile_debian_testing
index 65d3a1268923b025df24f3c3b6102394eb0a32b3..f051e12f82908803b98b7573ca5514f66267d866 100644
--- a/docker/Dockerfile_debian_testing
+++ b/docker/Dockerfile_debian_testing
@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control
diff --git a/docker/Dockerfile_debian_unstable b/docker/Dockerfile_debian_unstable
index e79dcccfe57f68c00e9359c40831f495b608c65b..766e6bb2cc0e06b40b74867b20f66a7a61214576 100644
--- a/docker/Dockerfile_debian_unstable
+++ b/docker/Dockerfile_debian_unstable
@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control
diff --git a/docker/Dockerfile_ubuntu_18.04 b/docker/Dockerfile_ubuntu_18.04
index ae5bc5b0549791e70c0e9a5d3bc5251c6d7a4aa8..7eaec5585fa128a3237eea546233940041f9d0cf 100644
--- a/docker/Dockerfile_ubuntu_18.04
+++ b/docker/Dockerfile_ubuntu_18.04
@@ -11,10 +11,6 @@ RUN apt-get update && \
         g++-8 \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control
diff --git a/docker/Dockerfile_ubuntu_20.04 b/docker/Dockerfile_ubuntu_20.04
index b79f1f5a97a44961355f53e510bdbf30f82c3fa5..a53807113e56104760a08582c71893f7033db88e 100644
--- a/docker/Dockerfile_ubuntu_20.04
+++ b/docker/Dockerfile_ubuntu_20.04
@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control
diff --git a/docker/Dockerfile_ubuntu_21.04 b/docker/Dockerfile_ubuntu_21.04
index 3dcbfb967190cc70678384906248a60ec7ec4431..00615d45626deb0c9319e3dc059f9d3f961f5b1b 100644
--- a/docker/Dockerfile_ubuntu_21.04
+++ b/docker/Dockerfile_ubuntu_21.04
@@ -9,10 +9,6 @@ RUN apt-get update && \
         equivs \
         wget
 
-# add deb-src entries (needed for next step)
-RUN sed -n '/^deb\s/s//deb-src /p' /etc/apt/sources.list > /etc/apt/sources.list.d/deb-src.list
-RUN apt-get clean && apt-get update
-
 ADD scripts/prebuild-package-debian.sh /opt/prebuild-package-debian.sh
 
 COPY packaging/rules/debian-qt/control /tmp/builddeps/debian/control