diff --git a/dev/codeinsights-db.sh b/dev/codeinsights-db.sh
index 1b4ae3fd4cd2..f7c803cc557e 100755
--- a/dev/codeinsights-db.sh
+++ b/dev/codeinsights-db.sh
@@ -12,7 +12,7 @@ fi
 
 IMAGE=sourcegraph/codeinsights-db:dev
 CONTAINER=codeinsights-db
-PORT=3370
+PORT=5435
 
 docker inspect $CONTAINER >/dev/null 2>&1 && docker rm -f $CONTAINER
 
@@ -55,6 +55,6 @@ docker run --rm \
   --cpus=1 \
   --memory=1g \
   -e POSTGRES_PASSWORD=password \
-  -p 0.0.0.0:5435:5435 \
+  -p 0.0.0.0:${PORT}:5432 \
   -v "${DISK}":/var/lib/postgresql/data \
   ${IMAGE} >"${LOG_FILE}" 2>&1 || finish
diff --git a/dev/start.sh b/dev/start.sh
index cbc19e0432a6..92edf1568391 100755
--- a/dev/start.sh
+++ b/dev/start.sh
@@ -61,6 +61,10 @@ export CODEINTEL_PGSSLMODE="${PGSSLMODE:-}"
 export CODEINTEL_PGDATASOURCE="${PGDATASOURCE:-}"
 export CODEINTEL_PG_ALLOW_SINGLE_DB=true
 
+# Code Insights uses a separate database, because it's easier to run TimescaleDB in
+# Docker than install as a Postgres extension in dev environments.
+export CODEINSIGHTS_PGDATASOURCE=postgres://postgres:password@127.0.0.1:5435
+
 # Default to "info" level debugging, and "condensed" log format (nice for human readers)
 export SRC_LOG_LEVEL=${SRC_LOG_LEVEL:-info}
 export SRC_LOG_FORMAT=${SRC_LOG_FORMAT:-condensed}