diff --git a/pcsx2/GS/GS.h b/pcsx2/GS/GS.h
index 00fdea7462..ead313f1dd 100644
--- a/pcsx2/GS/GS.h
+++ b/pcsx2/GS/GS.h
@@ -324,18 +324,6 @@ extern void fifo_free(void* ptr, size_t size, size_t repeat);
 extern const std::string root_sw;
 extern const std::string root_hw;
 
-#ifndef __has_attribute
-#  define __has_attribute(x) 0
-#endif
-
-#ifdef __cpp_constinit
-#  define CONSTINIT constinit
-#elif __has_attribute(require_constant_initialization)
-#  define CONSTINIT __attribute__((require_constant_initialization))
-#else
-#  define CONSTINIT
-#endif
-
 // MacOS headers define PAGE_SIZE to the size of an x86 page
 #ifdef PAGE_SIZE
 #  undef PAGE_SIZE
diff --git a/pcsx2/GS/GS_types.h b/pcsx2/GS/GS_types.h
index 29bac58c8d..eec8fea353 100644
--- a/pcsx2/GS/GS_types.h
+++ b/pcsx2/GS/GS_types.h
@@ -92,8 +92,14 @@ extern void vmfree(void* ptr, size_t size);
 
 #define countof(a) (sizeof(a) / sizeof(a[0]))
 
+#ifndef __has_attribute
+	#define __has_attribute(x) 0
+#endif
+
 #ifdef __cpp_constinit
 	#define CONSTINIT constinit
+#elif __has_attribute(require_constant_initialization)
+	#define CONSTINIT __attribute__((require_constant_initialization))
 #else
 	#define CONSTINIT
 #endif
@@ -114,12 +120,12 @@ extern void vmfree(void* ptr, size_t size);
 		#define _M_SSE 0x500
 	#elif defined(__SSE4_1__)
 		#define _M_SSE 0x401
+	#else
+		#error PCSX2 requires compiling for at least SSE 4.1
 	#endif
 
-#endif
+#elif _M_SSE < 0x401
 
-#if !defined(_M_SSE) && (!defined(_WIN32) || defined(_M_AMD64) || defined(_M_IX86_FP) && _M_IX86_FP >= 2)
-
-	#define _M_SSE 0x401
+	#error PCSX2 requires compiling for at least SSE 4.1
 
 #endif