diff --git a/engine/lib/heap.c b/engine/lib/heap.c
deleted file mode 100644
index f6b1484..0000000
--- a/engine/lib/heap.c
+++ /dev/null
@@ -1,32 +0,0 @@
-#include "ph7int.h"
-#if defined(__WINNT__)
-	#include <Windows.h>
-#else
-	#include <stdlib.h>
-#endif
-
-void *SyOSHeapAlloc(sxu32 nByte) {
-	void *pNew;
-#if defined(__WINNT__)
-	pNew = HeapAlloc(GetProcessHeap(), 0, nByte);
-#else
-	pNew = malloc((size_t)nByte);
-#endif
-	return pNew;
-}
-void *SyOSHeapRealloc(void *pOld, sxu32 nByte) {
-	void *pNew;
-#if defined(__WINNT__)
-	pNew = HeapReAlloc(GetProcessHeap(), 0, pOld, nByte);
-#else
-	pNew = realloc(pOld, (size_t)nByte);
-#endif
-	return pNew;
-}
-void SyOSHeapFree(void *pPtr) {
-#if defined(__WINNT__)
-	HeapFree(GetProcessHeap(), 0, pPtr);
-#else
-	free(pPtr);
-#endif
-}
\ No newline at end of file
diff --git a/engine/lib/memory.c b/engine/lib/memory.c
index b054ebd..4839bb5 100644
--- a/engine/lib/memory.c
+++ b/engine/lib/memory.c
@@ -1,5 +1,36 @@
+#if defined(__WINNT__)
+	#include <Windows.h>
+#else
+	#include <stdlib.h>
+#endif
+
 #include "ph7int.h"
 
+static void *SyOSHeapAlloc(sxu32 nByte) {
+	void *pNew;
+#if defined(__WINNT__)
+	pNew = HeapAlloc(GetProcessHeap(), 0, nByte);
+#else
+	pNew = malloc((size_t)nByte);
+#endif
+	return pNew;
+}
+static void *SyOSHeapRealloc(void *pOld, sxu32 nByte) {
+	void *pNew;
+#if defined(__WINNT__)
+	pNew = HeapReAlloc(GetProcessHeap(), 0, pOld, nByte);
+#else
+	pNew = realloc(pOld, (size_t)nByte);
+#endif
+	return pNew;
+}
+static void SyOSHeapFree(void *pPtr) {
+#if defined(__WINNT__)
+	HeapFree(GetProcessHeap(), 0, pPtr);
+#else
+	free(pPtr);
+#endif
+}
 PH7_PRIVATE void SyZero(void *pSrc, sxu32 nSize) {
 	register unsigned char *zSrc = (unsigned char *)pSrc;
 	unsigned char *zEnd;