diff --git a/src/codec/packet/mod.rs b/src/codec/packet/mod.rs
index eae6ab2..983f21a 100644
--- a/src/codec/packet/mod.rs
+++ b/src/codec/packet/mod.rs
@@ -8,7 +8,7 @@ use libc::c_int;
 use ffi::*;
 
 bitflags! {
-	flags Flags: i32 {
+	flags Flags: c_int {
 		const FLAG_KEY     = AV_PKT_FLAG_KEY,
 		const FLAG_CORRUPT = AV_PKT_FLAG_CORRUPT,
 	}