diff --git a/src/modules/filesystem/physfs/Filesystem.cpp b/src/modules/filesystem/physfs/Filesystem.cpp
index 915782e0f..21a42f349 100644
--- a/src/modules/filesystem/physfs/Filesystem.cpp
+++ b/src/modules/filesystem/physfs/Filesystem.cpp
@@ -560,7 +560,7 @@ namespace physfs
 	int Filesystem::getLastModified(lua_State * L)
 	{
 		const char * filename = luaL_checkstring(L, 1);
-		int64_t time = PHYSFS_getLastModTime(filename);
+		PHYSFS_sint64 time = PHYSFS_getLastModTime(filename);
 		if (time == -1)
 		{
 			lua_pushnil(L);