diff --git a/test/infra/control/env-isolated.bash b/test/infra/control/env-isolated.bash
index 4585a2258..d1883c5d8 100755
--- a/test/infra/control/env-isolated.bash
+++ b/test/infra/control/env-isolated.bash
@@ -56,6 +56,7 @@ export TESTS_LOGS_PATH="${WORKSPACE}/ci_infra_logs/${INFRA_ID}/tests"
 export TAP_WORKDIR="${WORKSPACE}/test/tap/tests/"
 export TAP_WORKDIRS="${WORKSPACE}/test/tap/tests/ ${WORKSPACE}/test/tap/tests_with_deps/deprecate_eof_support/ ${WORKSPACE}/test/tap/tests/unit/"
 export TAP_DEPS="${WORKSPACE}/test/tap/tap"
+export TAP_DEPS_PATH="${WORKSPACE}/test/tap/tap"
 export TEST_DEPS_PATH="${WORKSPACE}/test-scripts/deps"
 export TEST_DEPS="${TEST_DEPS_PATH}"
 
diff --git a/test/infra/control/run-tests-isolated.bash b/test/infra/control/run-tests-isolated.bash
index 4ecd249e3..298bc37c9 100755
--- a/test/infra/control/run-tests-isolated.bash
+++ b/test/infra/control/run-tests-isolated.bash
@@ -143,6 +143,11 @@ fi
 if [ "${SKIP_PROXYSQL}" = "1" ]; then
     echo ">>> Running tests directly on the host (no Docker container)..."
 
+    # Ensure transitive shared libs (e.g. libparser.so via libcpp_dotenv.so) are found.
+    # RUNPATH in intermediate libraries may contain stale absolute paths from the
+    # original build, so we add the known library directories explicitly.
+    export LD_LIBRARY_PATH="${WORKSPACE}/test/tap/tap${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
+
     # Discover test binaries from groups.json for this TAP_GROUP
     GROUPS_JSON="${WORKSPACE}/test/tap/groups/groups.json"
     if [ ! -f "${GROUPS_JSON}" ]; then