diff --git a/test/leak/leak.sh b/test/leak/leak.sh
index 998efeba..7763ba07 100755
--- a/test/leak/leak.sh
+++ b/test/leak/leak.sh
@@ -16,5 +16,5 @@ for test in ./test/unit/*.js; do
     --show-leak-kinds=definite,indirect,possible \
     --num-callers=20 \
     --trace-children=yes \
-    node node_modules/.bin/mocha --slow=60000 --timeout=120000 --file test/unit/beforeEach.js "$test";
+    node --expose-gc node_modules/.bin/mocha --slow=60000 --timeout=120000 --file test/unit/beforeEach.js "$test";
 done
diff --git a/test/unit/beforeEach.js b/test/unit/beforeEach.js
index 33e76e82..7fc0b9f2 100644
--- a/test/unit/beforeEach.js
+++ b/test/unit/beforeEach.js
@@ -12,3 +12,9 @@ beforeEach(function () {
   sharp.simd(usingSimd);
   sharp.concurrency(concurrency);
 });
+
+afterEach(function () {
+  if (global.gc) {
+    global.gc();
+  }
+});