diff --git a/installer/lib/requirements-ubuntu-xenial.apt b/installer/lib/requirements-ubuntu-xenial.apt
index 121c02269..48d97befa 100644
--- a/installer/lib/requirements-ubuntu-xenial.apt
+++ b/installer/lib/requirements-ubuntu-xenial.apt
@@ -59,7 +59,6 @@ postgresql-client
 pwgen
 python3
 python3-dev
-python3-dev
 python3-gi
 python3-gi-cairo
 python3-gst-1.0
diff --git a/installer/lib/requirements-ubuntu-xenial_docker_minimal.apt b/installer/lib/requirements-ubuntu-xenial_docker_minimal.apt
index fc2777d35..549db5c9d 100644
--- a/installer/lib/requirements-ubuntu-xenial_docker_minimal.apt
+++ b/installer/lib/requirements-ubuntu-xenial_docker_minimal.apt
@@ -51,7 +51,6 @@ postgresql-client
 pwgen
 python3
 python3-dev
-python3-dev
 python3-gst-1.0
 python3-pika
 python3-pip