diff --git a/src/formats.c b/src/formats.c
index 49719912..533b834e 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -649,6 +649,7 @@ static const char* extension_list[] = {
     "xa",
     "xa2",
     "xa30",
+    "xai",
     "xag", //txth/reserved [Tamsoft's PS2 games]
     "xau",
     "xav",
diff --git a/src/meta/xa.c b/src/meta/xa.c
index 3bd7745e..6200a5c4 100644
--- a/src/meta/xa.c
+++ b/src/meta/xa.c
@@ -39,8 +39,9 @@ VGMSTREAM* init_vgmstream_xa(STREAMFILE* sf) {
      * .pxa: Mortal Kombat 4 (PS1)
      * .grn: Micro Machines (CDi)
      * .an2: Croc (PS1) movies
+     * .xai: Quake II (PS1)
      * (extensionless): bigfiles [Castlevania: Symphony of the Night (PS1)] */
-    if (!check_extensions(sf,"xa,str,pxa,grn,an2,"))
+    if (!check_extensions(sf,"xa,str,pxa,grn,an2,,xai"))
         goto fail;
 
     /* Proper XA comes in raw (BIN 2352 mode2/form2) CD sectors, that contain XA subheaders.