diff --git a/dlls/usp10/usp10.c b/dlls/usp10/usp10.c
index f8a6aa539af..9a558b4adbe 100644
--- a/dlls/usp10/usp10.c
+++ b/dlls/usp10/usp10.c
@@ -710,17 +710,17 @@ typedef struct {
     WORD target;
 } FindGlyph_struct;
 
-static inline void *heap_alloc(SIZE_T size)
+static inline void* __WINE_ALLOC_SIZE(1) heap_alloc(size_t size)
 {
     return HeapAlloc(GetProcessHeap(), 0, size);
 }
 
-static inline void *heap_alloc_zero(SIZE_T size)
+static inline void* __WINE_ALLOC_SIZE(1) heap_alloc_zero(size_t size)
 {
     return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
 }
 
-static inline BOOL heap_free(LPVOID mem)
+static inline BOOL heap_free(void *mem)
 {
     return HeapFree(GetProcessHeap(), 0, mem);
 }