diff --git a/src/common/thread.cpp b/src/common/thread.cpp
index 9e207118f..a7267b637 100644
--- a/src/common/thread.cpp
+++ b/src/common/thread.cpp
@@ -25,16 +25,6 @@
 
 namespace Common {
 
-int CurrentThreadId() {
-#ifdef _MSC_VER
-    return GetCurrentThreadId();
-#elif defined __APPLE__
-    return mach_thread_self();
-#else
-    return 0;
-#endif
-}
-
 #ifdef _WIN32
 // Supporting functions
 void SleepCurrentThread(int ms) {
diff --git a/src/common/thread.h b/src/common/thread.h
index 6cbdb96a3..c20809021 100644
--- a/src/common/thread.h
+++ b/src/common/thread.h
@@ -13,8 +13,6 @@
 
 namespace Common {
 
-int CurrentThreadId();
-
 void SetThreadAffinity(std::thread::native_handle_type thread, u32 mask);
 void SetCurrentThreadAffinity(u32 mask);