diff --git a/debian-bullseye-build/Dockerfile b/debian-bullseye-build/Dockerfile
index dcea217a..14f5625b 100644
--- a/debian-bullseye-build/Dockerfile
+++ b/debian-bullseye-build/Dockerfile
@@ -21,6 +21,7 @@ RUN	apt-get update && \
 		devscripts \
 		dh-autoreconf \
 		doxygen \
+		equivs \
 		flex \
 		g++ \
 		gawk \
diff --git a/debian-buster-build/Dockerfile b/debian-buster-build/Dockerfile
index 87ada0fe..b80d8810 100644
--- a/debian-buster-build/Dockerfile
+++ b/debian-buster-build/Dockerfile
@@ -22,6 +22,7 @@ RUN	apt-get update && \
 		dh-autoreconf \
 		dh-systemd \
 		doxygen \
+		equivs \
 		flex \
 		g++ \
 		gawk \
diff --git a/debian-jessie-build/Dockerfile b/debian-jessie-build/Dockerfile
index b0437626..141d2586 100644
--- a/debian-jessie-build/Dockerfile
+++ b/debian-jessie-build/Dockerfile
@@ -18,6 +18,7 @@ RUN	apt-get update && \
 		dh-autoreconf \
 		dh-systemd \
 		doxygen \
+		equivs \
 		flex \
 		g++ \
 		gawk \