diff --git a/dlls/winhttp/request.c b/dlls/winhttp/request.c
index 7b47ed9349a..158cb13d012 100644
--- a/dlls/winhttp/request.c
+++ b/dlls/winhttp/request.c
@@ -2958,7 +2958,7 @@ BOOL WINAPI WinHttpQueryDataAvailable( HINTERNET hrequest, LPDWORD available )
 
 static void task_read_data( struct task_header *task )
 {
-    read_data_t *r = (read_data_t *)task;
+    struct read_data *r = (struct read_data *)task;
     read_data( r->hdr.request, r->buffer, r->to_read, r->read, TRUE );
 }
 
@@ -2986,9 +2986,9 @@ BOOL WINAPI WinHttpReadData( HINTERNET hrequest, LPVOID buffer, DWORD to_read, L
 
     if (request->connect->hdr.flags & WINHTTP_FLAG_ASYNC)
     {
-        read_data_t *r;
+        struct read_data *r;
 
-        if (!(r = heap_alloc( sizeof(read_data_t) ))) return FALSE;
+        if (!(r = heap_alloc( sizeof(struct read_data) ))) return FALSE;
         r->hdr.request = request;
         r->hdr.proc    = task_read_data;
         r->buffer      = buffer;
diff --git a/dlls/winhttp/winhttp_private.h b/dlls/winhttp/winhttp_private.h
index 1f33ea48d76..b29cddfa785 100644
--- a/dlls/winhttp/winhttp_private.h
+++ b/dlls/winhttp/winhttp_private.h
@@ -243,13 +243,13 @@ struct query_data
     DWORD *available;
 };
 
-typedef struct
+struct read_data
 {
     struct task_header hdr;
-    LPVOID buffer;
+    void *buffer;
     DWORD to_read;
-    LPDWORD read;
-} read_data_t;
+    DWORD *read;
+};
 
 typedef struct
 {