diff --git a/.github/workflows/main-ci.yml b/.github/workflows/main-ci.yml
index 299fba5..e90bac8 100644
--- a/.github/workflows/main-ci.yml
+++ b/.github/workflows/main-ci.yml
@@ -20,6 +20,7 @@ jobs:
       - name: test Zenoh
         run: |
           set -x
+          ( cd zenoh && patch -p1 < ../zenoh-patch.diff )
           sudo chown -R 1000 zenoh
           time docker run \
             -v $(realpath zenoh):/src \
diff --git a/README.md b/README.md
index 02b318e..215c0af 100644
--- a/README.md
+++ b/README.md
@@ -21,4 +21,4 @@ A container is created which contains a sysroot and image:
     - Target is a QEMU image, simulating an aarch64 CPU
     - Tests are executed on target using the script [run_on_target.sh](scripts/run_on_target.sh), which
         uploads the file and runs it.
-    - WARNING: It only executes one (small) unit test to reduce the disk usage. Standard Github action runners run out of space otherwise.
+    - The zenoh build configuration is slightly changed to reduce disk space usage (especially debug symbols are disabled, see [patch](./zenoh-patch.diff) for details)
diff --git a/scripts/test-zenoh.sh b/scripts/test-zenoh.sh
index 4c17809..6f22b6e 100755
--- a/scripts/test-zenoh.sh
+++ b/scripts/test-zenoh.sh
@@ -17,10 +17,21 @@ cd /src
 ssh target "mkdir -p /tmp/test/a/b"
 scp DEFAULT_CONFIG.json5 target:/tmp/test
 
+# The runners sometimes run out of disk space, which is why it is monitored:
+show_res_usage () {
+    set +ex
+    sleep 5
+    while true ; do
+        sleep 10
+        echo "$(echo ============ && df -h . && du -shc target/* && echo ============)"
+    done
+}
+show_res_usage &
+
 # Run tests
 if [[ "$*" == *"--only-one-test"* ]] ; then
     # only run one small test, as we would run out of disk space otherwise (on standard Github action runners)
     cd commons/zenoh-buffers
 fi
-df -h .
-cargo t --target aarch64-unknown-linux-gnu --release
+
+cargo t --target aarch64-unknown-linux-gnu -j1
diff --git a/zenoh-patch.diff b/zenoh-patch.diff
new file mode 100644
index 0000000..4b9a44f
--- /dev/null
+++ b/zenoh-patch.diff
@@ -0,0 +1,19 @@
+diff --git a/Cargo.toml b/Cargo.toml
+index 4e1c6299..bf7d6efc 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -204,8 +204,13 @@ zenoh-runtime = { version = "0.11.0", path = "commons/zenoh-runtime" }
+ zenoh-task = { version = "0.11.0", path = "commons/zenoh-task" }
+ 
+ [profile.dev]
+-debug = true
+-opt-level = 0
++debug = false
++debug-assertions = false
++lto = false
++strip = true
++incremental = false
++opt-level = "s"
+ 
+ [profile.fast]
+ inherits = "release"