diff --git a/src/bun.js/bindings/BunProcess.cpp b/src/bun.js/bindings/BunProcess.cpp
index a6d2b794e1..422be9b37f 100644
--- a/src/bun.js/bindings/BunProcess.cpp
+++ b/src/bun.js/bindings/BunProcess.cpp
@@ -2334,7 +2334,7 @@ JSC_DEFINE_HOST_FUNCTION(Process_functionConstrainedMemory,
 #if OS(LINUX) || OS(FREEBSD)
     return JSValue::encode(jsDoubleNumber(static_cast<double>(WTF::ramSize())));
 #else
-    return JSValue::encode(jsUndefined());
+    return JSValue::encode(jsNumber(0)); // TODO:
 #endif
 }
 
diff --git a/test/js/node/test/parallel/process-constrained-memory.test.js b/test/js/node/test/parallel/process-constrained-memory.test.js
new file mode 100644
index 0000000000..1c841556c8
--- /dev/null
+++ b/test/js/node/test/parallel/process-constrained-memory.test.js
@@ -0,0 +1,11 @@
+//#FILE: test-process-constrained-memory.js
+//#SHA1: 6c09d5733a7ac49f00b4923125a023c670423adf
+//-----------------
+"use strict";
+
+test("process.constrainedMemory()", () => {
+  const constrainedMemory = process.constrainedMemory();
+  expect(typeof constrainedMemory).toBe("number");
+});
+
+//<#END_FILE: test-process-constrained-memory.js