diff --git a/ggsn-test/Dockerfile b/ggsn-test/Dockerfile
index 412ba599..5a29922a 100644
--- a/ggsn-test/Dockerfile
+++ b/ggsn-test/Dockerfile
@@ -6,10 +6,12 @@ RUN	cd osmo-ttcn3-hacks && \
 	git checkout -f -B master origin/master && \
 	make deps
 
-ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch /tmp/commit
+ARG	OSMO_TTCN3_BRANCH="master"
+
+ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
 RUN	cd osmo-ttcn3-hacks && \
 	git fetch && \
-	git checkout -f -B master origin/master && \
+	git checkout -f -B $OSMO_TTCN3_BRANCH origin/$OSMO_TTCN3_BRANCH && \
 	make ggsn_tests
 
 VOLUME	/data
diff --git a/mgw-test/Dockerfile b/mgw-test/Dockerfile
index 4015d994..2603ee60 100644
--- a/mgw-test/Dockerfile
+++ b/mgw-test/Dockerfile
@@ -7,10 +7,12 @@ RUN	cd osmo-ttcn3-hacks && \
 	git checkout -f -B master origin/master && \
 	make deps
 
-ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch /tmp/commit
+ARG	OSMO_TTCN3_BRANCH="master"
+
+ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
 RUN	cd osmo-ttcn3-hacks && \
 	git fetch && \
-	git checkout -f -B master origin/master && \
+	git checkout -f -B $OSMO_TTCN3_BRANCH origin/$OSMO_TTCN3_BRANCH && \
 	make mgw
 
 VOLUME	/data
diff --git a/ttcn3-bsc-test/Dockerfile b/ttcn3-bsc-test/Dockerfile
index acb38ce1..4ce55b80 100644
--- a/ttcn3-bsc-test/Dockerfile
+++ b/ttcn3-bsc-test/Dockerfile
@@ -10,10 +10,12 @@ RUN	cd osmo-ttcn3-hacks && \
 RUN	git config --global user.email docker@dock.er && \
 	git config --global user.name "Dock Er"
 
-ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch /tmp/commit
+ARG	OSMO_TTCN3_BRANCH="master"
+
+ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
 RUN	cd osmo-ttcn3-hacks && \
 	git fetch && \
-	git checkout -f -B master origin/master && \
+	git checkout -f -B $OSMO_TTCN3_BRANCH origin/$OSMO_TTCN3_BRANCH && \
 	git cherry-pick 5ce5241d6d460e9b36a908ac7072d8ea68df08db && \
 	make bsc
 
diff --git a/ttcn3-msc-test/Dockerfile b/ttcn3-msc-test/Dockerfile
index 7252443e..e9b3cf61 100644
--- a/ttcn3-msc-test/Dockerfile
+++ b/ttcn3-msc-test/Dockerfile
@@ -10,10 +10,12 @@ RUN	cd osmo-ttcn3-hacks && \
 RUN	git config --global user.email docker@dock.er && \
 	git config --global user.name "Dock Er"
 
-ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch /tmp/commit
+ARG	OSMO_TTCN3_BRANCH="master"
+
+ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
 RUN	cd osmo-ttcn3-hacks && \
 	git fetch && \
-	git checkout -f -B master origin/master && \
+	git checkout -f -B $OSMO_TTCN3_BRANCH origin/$OSMO_TTCN3_BRANCH && \
 	git cherry-pick 5ce5241d6d460e9b36a908ac7072d8ea68df08db && \
 	make msc
 
diff --git a/ttcn3-nitb-sysinfo/Dockerfile b/ttcn3-nitb-sysinfo/Dockerfile
index b7921ac3..89be2e0f 100644
--- a/ttcn3-nitb-sysinfo/Dockerfile
+++ b/ttcn3-nitb-sysinfo/Dockerfile
@@ -7,10 +7,12 @@ RUN	cd osmo-ttcn3-hacks && \
 	git checkout -f -B master origin/master && \
 	make deps
 
-ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch /tmp/commit
+ARG	OSMO_TTCN3_BRANCH="master"
+
+ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
 RUN	cd osmo-ttcn3-hacks && \
 	git fetch && \
-	git checkout -f -B master origin/master && \
+	git checkout -f -B $OSMO_TTCN3_BRANCH origin/$OSMO_TTCN3_BRANCH && \
 	make sysinfo
 
 VOLUME	/data