diff --git a/src/KingSystem/Utils/HeapUtil.h b/src/KingSystem/Utils/HeapUtil.h
index bc6730c6..b5629aa7 100644
--- a/src/KingSystem/Utils/HeapUtil.h
+++ b/src/KingSystem/Utils/HeapUtil.h
@@ -102,7 +102,7 @@ sead::Heap* getCurrentHeap();
 sead::Heap* getDebugHeap();
 sead::Heap* getDebugHeap2();
 
-[[gnu::always_inline]] inline sead::Heap* tryCreateDualHeap(sead::Heap* parent) {
+KSYS_ALWAYS_INLINE inline sead::Heap* tryCreateDualHeap(sead::Heap* parent) {
     size_t size;
 
     if (const auto* parent_ex = sead::DynamicCast<DualHeap>(parent)) {
diff --git a/src/KingSystem/Utils/Types.h b/src/KingSystem/Utils/Types.h
index cc2b6e4b..941ec17c 100644
--- a/src/KingSystem/Utils/Types.h
+++ b/src/KingSystem/Utils/Types.h
@@ -7,3 +7,8 @@
 #else
 #define KSYS_CHECK_SIZE_NX150(CLASS, SIZE) static_assert(sizeof(CLASS) == SIZE)
 #endif
+
+#ifdef __GNUC__
+#define KSYS_ALWAYS_INLINE [[gnu::always_inline]]
+#define KSYS_VISIBILITY_HIDDEN [[gnu::visibility("hidden")]]
+#endif