diff --git a/libavcodec/arm/idctdsp_init_arm.c b/libavcodec/arm/idctdsp_init_arm.c
index 31d9428a8b..578697e88e 100644
--- a/libavcodec/arm/idctdsp_init_arm.c
+++ b/libavcodec/arm/idctdsp_init_arm.c
@@ -71,7 +71,7 @@ av_cold void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx,
     ff_add_pixels_clamped = c->add_pixels_clamped;
 
     if (!avctx->lowres && !high_bit_depth) {
-        if (avctx->idct_algo == FF_IDCT_AUTO ||
+        if ((avctx->idct_algo == FF_IDCT_AUTO && !(avctx->flags & CODEC_FLAG_BITEXACT)) ||
             avctx->idct_algo == FF_IDCT_ARM) {
             c->idct_put  = j_rev_dct_arm_put;
             c->idct_add  = j_rev_dct_arm_add;
diff --git a/libavcodec/arm/idctdsp_init_armv6.c b/libavcodec/arm/idctdsp_init_armv6.c
index 510508295c..648f1fdfc1 100644
--- a/libavcodec/arm/idctdsp_init_armv6.c
+++ b/libavcodec/arm/idctdsp_init_armv6.c
@@ -33,7 +33,7 @@ av_cold void ff_idctdsp_init_armv6(IDCTDSPContext *c, AVCodecContext *avctx,
                                    unsigned high_bit_depth)
 {
     if (!avctx->lowres && !high_bit_depth) {
-        if (avctx->idct_algo == FF_IDCT_AUTO ||
+        if ((avctx->idct_algo == FF_IDCT_AUTO && !(avctx->flags & CODEC_FLAG_BITEXACT)) ||
             avctx->idct_algo == FF_IDCT_SIMPLEARMV6) {
             c->idct_put  = ff_simple_idct_put_armv6;
             c->idct_add  = ff_simple_idct_add_armv6;