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-rw-r--r--tests/docker/dockerfiles/debian.docker2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/docker/dockerfiles/debian.docker b/tests/docker/dockerfiles/debian.docker
index e44ce2f1c0..b0e1691beb 100644
--- a/tests/docker/dockerfiles/debian.docker
+++ b/tests/docker/dockerfiles/debian.docker
@@ -10,7 +10,7 @@
FROM debian:stable-slim
# Duplicate deb line as deb-src
-RUN cat /etc/apt/sources.list | sed "s/deb/deb-src/" >> /etc/apt/sources.list
+RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
# Install common build utilities
RUN apt update