diff --git a/libavcodec/aacps.c b/libavcodec/aacps.c
index 8f55c7f3c0..df069c3e6d 100644
--- a/libavcodec/aacps.c
+++ b/libavcodec/aacps.c
@@ -139,7 +139,7 @@ static int ps_read_extension_data(GetBitContext *gb, PSContext *ps, int ps_exten
     return get_bits_count(gb) - count;
 }
 
-static void ipdopd_reset(int8_t *opd_hist, int8_t *ipd_hist)
+static void ipdopd_reset(int8_t *ipd_hist, int8_t *opd_hist)
 {
     int i;
     for (i = 0; i < PS_MAX_NR_IPDOPD; i++) {