diff --git a/platform/javascript/detect.py b/platform/javascript/detect.py
index 5b7bcbc97c4..4bcbdc11c97 100644
--- a/platform/javascript/detect.py
+++ b/platform/javascript/detect.py
@@ -139,6 +139,7 @@ def configure(env):
         env.Append(LINKFLAGS=["-s", "USE_PTHREADS=1"])
         env.Append(LINKFLAGS=["-s", "PTHREAD_POOL_SIZE=4"])
         env.Append(LINKFLAGS=["-s", "WASM_MEM_MAX=2048MB"])
+        env.extra_suffix = ".threads" + env.extra_suffix
     else:
         env.Append(CPPDEFINES=["NO_THREADS"])