diff --git a/scripts/clusterfuzz/run.py b/scripts/clusterfuzz/run.py
index b8763aa73f6..abd1d5ad5ba 100755
--- a/scripts/clusterfuzz/run.py
+++ b/scripts/clusterfuzz/run.py
@@ -32,7 +32,7 @@
 
 # The V8 flags we put in the "fuzzer flags" files, which tell ClusterFuzz how to
 # run V8. By default we apply all staging flags.
-FUZZER_FLAGS = '--wasm-staging --experimental-wasm-custom-descriptors'
+FUZZER_FLAGS = '--wasm-staging --experimental-wasm-custom-descriptors --experimental-wasm-js-interop'
 
 # Optional V8 flags to add to FUZZER_FLAGS, some of the time.
 OPTIONAL_FUZZER_FLAGS = [
diff --git a/scripts/test/shared.py b/scripts/test/shared.py
index c5495f37910..18ca85d9033 100644
--- a/scripts/test/shared.py
+++ b/scripts/test/shared.py
@@ -253,6 +253,7 @@ def has_shell_timeout():
     '--experimental-wasm-stringref',
     '--experimental-wasm-fp16',
     '--experimental-wasm-custom-descriptors',
+    '--experimental-wasm-js-interop',
 ]
 
 # external tools