diff --git a/Core/HLE/sceKernelThread.cpp b/Core/HLE/sceKernelThread.cpp
index acd1c58ddc..b705b8e238 100644
--- a/Core/HLE/sceKernelThread.cpp
+++ b/Core/HLE/sceKernelThread.cpp
@@ -845,7 +845,7 @@ u32 __KernelInterruptReturnAddress()
 	return intReturnHackAddr;
 }
 
-u32 __KernelSetThreadRA(SceUID threadID, int nid)
+u32 __KernelSetThreadRA(SceUID threadID, u32 nid)
 {
 	u32 newRA;
 	switch (nid)
diff --git a/Core/HLE/sceKernelThread.h b/Core/HLE/sceKernelThread.h
index 69204621c3..7f16ad8bb6 100644
--- a/Core/HLE/sceKernelThread.h
+++ b/Core/HLE/sceKernelThread.h
@@ -235,7 +235,7 @@ bool __KernelSwitchToThread(SceUID threadID, const char *reason);
 
 // Set a thread's return address to a specific FakeSyscall nid.
 // Discards old RA.  Only useful for special threads that do special things on exit.
-u32 __KernelSetThreadRA(SceUID threadID, int nid);
+u32 __KernelSetThreadRA(SceUID threadID, u32 nid);
 
 // A call into game code. These can be pending on a thread.
 // Similar to Callback-s (NOT CallbackInfos) in JPCSP.