diff --git a/alib-build/Dockerfile b/alib-build/Dockerfile
index 590fcffc241d0c232af18565cad9c4f60bfdf73d..ca63252d5db01104d0dcbf2903456f4d4c329325 100644
--- a/alib-build/Dockerfile
+++ b/alib-build/Dockerfile
@@ -1,4 +1,4 @@
 FROM amd64/debian:testing-slim
 
-RUN apt-get update \\
+RUN apt-get update \
 	&& apt-get install -y build-essential cmake make python3 libcppunit-dev libxml2-dev libtclap-dev libreadline-dev qtbase5-dev graphviz-dev libjsoncpp-dev clang-7