diff --git a/storm/thread/SSyncObject.cpp b/storm/thread/SSyncObject.cpp
index 3e6738e..578d3b5 100644
--- a/storm/thread/SSyncObject.cpp
+++ b/storm/thread/SSyncObject.cpp
@@ -12,6 +12,16 @@ SSyncObject::SSyncObject() {
 #endif
 }
 
+bool SSyncObject::Valid() {
+#if defined(WHOA_SYSTEM_WIN)
+    return this->m_opaqueData != nullptr;
+#endif
+
+#if defined(WHOA_SYSTEM_MAC) || defined(WHOA_SYSTEM_LINUX)
+    return this->int0 - 1 <= 4;
+#endif
+}
+
 uint32_t SSyncObject::Wait(uint32_t timeoutMs) {
 #if defined(WHOA_SYSTEM_WIN)
     return WaitForSingleObject(this->m_opaqueData, timeoutMs);
diff --git a/storm/thread/SSyncObject.hpp b/storm/thread/SSyncObject.hpp
index bf18bff..232b4d1 100644
--- a/storm/thread/SSyncObject.hpp
+++ b/storm/thread/SSyncObject.hpp
@@ -29,7 +29,7 @@ class SSyncObject {
     // Member functions
     SSyncObject();
     void Close(void);
-    bool Valid(void);
+    bool Valid();
     uint32_t Wait(uint32_t timeoutMs);
 };