diff --git a/.evergreen/run-granular-benchmarks.sh b/.evergreen/run-granular-benchmarks.sh
index 52960320..81ae7619 100644
--- a/.evergreen/run-granular-benchmarks.sh
+++ b/.evergreen/run-granular-benchmarks.sh
@@ -1,8 +1,10 @@
 #!/usr/bin/env bash
 
+if [[ -z "${PROJECT_DIRECTORY}" ]]; then echo "PROJECT_DIRECTORY is unset" && exit 1; fi
 source "${PROJECT_DIRECTORY}/.evergreen/init-node-and-npm-env.sh"
+
 set -o xtrace
 WARMUP=$WARMUP
 ITERATIONS=$ITERATIONS
 
-WARMUP=$WARMUP ITERATIONS=$ITERATIONS npm run check:granular-bench
+WARMUP=$WARMUP ITERATIONS=$ITERATIONS LIBRARY=$PROJECT_DIRECTORY npm run check:granular-bench
diff --git a/.evergreen/run-spec-benchmarks.sh b/.evergreen/run-spec-benchmarks.sh
index 5ce90833..8de484f1 100644
--- a/.evergreen/run-spec-benchmarks.sh
+++ b/.evergreen/run-spec-benchmarks.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 
+if [[ -z "${PROJECT_DIRECTORY}" ]]; then echo "PROJECT_DIRECTORY is unset" && exit 1; fi
 source "${PROJECT_DIRECTORY}/.evergreen/init-node-and-npm-env.sh"
 
-npm run check:spec-bench
+LIBRARY=$PROJECT_DIRECTORY npm run check:spec-bench