diff --git a/source/blender/editors/sound/sound_ops.cc b/source/blender/editors/sound/sound_ops.cc
index ab2df09a04e..3251b9ca7a9 100644
--- a/source/blender/editors/sound/sound_ops.cc
+++ b/source/blender/editors/sound/sound_ops.cc
@@ -431,6 +431,7 @@ static const char *snd_ext_sound[] = {
     ".mp3",
     ".ogg",
     ".wav",
+    ".aac",
     nullptr,
 };
 
@@ -445,7 +446,7 @@ static bool sound_mixdown_check(bContext * /*C*/, wmOperator *op)
     if (item->value == container) {
       const char **ext = snd_ext_sound;
       while (*ext != nullptr) {
-        if (STREQ(*ext + 1, item->name)) {
+        if (STRCASEEQ(*ext + 1, item->name)) {
           extension = *ext;
           break;
         }