diff --git a/src/Cafe/OS/libs/coreinit/coreinit_Thread.h b/src/Cafe/OS/libs/coreinit/coreinit_Thread.h
index a0517d9a..f369f800 100644
--- a/src/Cafe/OS/libs/coreinit/coreinit_Thread.h
+++ b/src/Cafe/OS/libs/coreinit/coreinit_Thread.h
@@ -88,8 +88,6 @@ typedef struct
 
 static_assert(sizeof(crt_t) == 0x1D8, "");
 
-#pragma pack(1)
-
 namespace coreinit
 {
 
@@ -275,6 +273,8 @@ namespace coreinit
 		/* +0x04 */ MEMPTR<struct OSMutex> prev;
 	};
 
+	static_assert(sizeof(OSFastMutexLink) == 0x8);
+
 	struct OSFastMutex
 	{
 		/* +0x00 */ uint32be magic;
@@ -620,8 +620,6 @@ namespace coreinit
 	void __OSDeleteAllActivePPCThreads();
 }
 
-#pragma pack()
-
 // deprecated / clean up required
 extern MPTR activeThread[256];
 extern sint32 activeThreadCount;