diff --git a/panda/src/movies/ffmpegVirtualFile.cxx b/panda/src/movies/ffmpegVirtualFile.cxx
index a00680e252..54adedbb41 100644
--- a/panda/src/movies/ffmpegVirtualFile.cxx
+++ b/panda/src/movies/ffmpegVirtualFile.cxx
@@ -107,8 +107,8 @@ pandavfs_write(URLContext *h, const unsigned char *buf, int size) {
 //       Access: Static Function
 //  Description: A hook to seek a panda VFS file.
 ////////////////////////////////////////////////////////////////////
-static PN_int64
-pandavfs_seek(URLContext *h, PN_int64 pos, int whence) {
+static int64_t
+pandavfs_seek(URLContext *h, int64_t pos, int whence) {
   istream *s = (istream*)(h->priv_data);
   switch(whence) {
   case SEEK_SET: s->seekg(pos, ios::beg); break;