diff --git a/src/coding/acm_decoder.c b/src/coding/acm_decoder.c
index e1dd102c..2b12c383 100644
--- a/src/coding/acm_decoder.c
+++ b/src/coding/acm_decoder.c
@@ -822,20 +822,19 @@ void acm_reset(ACMStream *acm)
  * interface to vgmstream
  ***********************************************/
 
-mus_acm_codec_data *init_acm(int files) {
-    mus_acm_codec_data* data = NULL;
+acm_codec_data *init_acm(STREAMFILE *streamFile) {
+    acm_codec_data* data = NULL;
+    ACMStream *acm_stream = NULL;
+    char filename[PATH_LIMIT];
 
-    if (files == 0)
-        goto fail;
-
-    data = calloc(1,sizeof(mus_acm_codec_data));
+    data = calloc(1,sizeof(acm_codec_data));
     if (!data) goto fail;
 
-    data->files = calloc(files,sizeof(ACMStream *));
-    if (!data->files) goto fail;
+    streamFile->get_name(streamFile,filename,sizeof(filename));
+    if (acm_open_decoder(&acm_stream,streamFile,filename) != ACM_OK)
+        goto fail;
 
-    data->file_count = files;
-    data->current_file = 0;
+    data->file = acm_stream;
 
     return data;
 
@@ -844,8 +843,10 @@ fail:
     return NULL;
 }
 
-void decode_acm(ACMStream * acm, sample * outbuf, int32_t samples_to_do, int channelspacing) {
+void decode_acm(acm_codec_data *data, sample * outbuf, int32_t samples_to_do, int channelspacing) {
+    ACMStream * acm = data->file;
     int32_t samples_read = 0;
+
     while (samples_read < samples_to_do) {
         int32_t bytes_read_just_now = acm_read(
                 acm,
@@ -862,30 +863,18 @@ void decode_acm(ACMStream * acm, sample * outbuf, int32_t samples_to_do, int cha
 }
 
 void reset_acm(VGMSTREAM *vgmstream) {
-    mus_acm_codec_data *data = vgmstream->codec_data;
-    int i;
-    if (data) {
-        data->current_file = 0;
-        for (i=0;i<data->file_count;i++) {
-            acm_reset(data->files[i]);
-        }
+    acm_codec_data *data = vgmstream->codec_data;
+
+    if (data && data->file) {
+        acm_reset(data->file);
     }
 }
 
-void free_acm(mus_acm_codec_data *data) {
+void free_acm(acm_codec_data *data) {
     if (data) {
-        if (data->files) {
-            int i;
-            for (i = 0; i < data->file_count; i++) {
-                /* shouldn't be duplicates */
-                if (data->files[i]) {
-                    acm_close(data->files[i]);
-                }
-
-            }
-            free(data->files);
+        if (data->file) {
+            acm_close(data->file);
         }
-
         free(data);
     }
 }
diff --git a/src/coding/coding.h b/src/coding/coding.h
index 4488dace..5d1680e3 100644
--- a/src/coding/coding.h
+++ b/src/coding/coding.h
@@ -102,10 +102,10 @@ void decode_cbd2_int(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspac
 void decode_ws(VGMSTREAM * vgmstream, int channel, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do);
 
 /* acm_decoder */
-mus_acm_codec_data *init_acm(int files);
-void decode_acm(ACMStream * acm, sample * outbuf, int32_t samples_to_do, int channelspacing);
+acm_codec_data *init_acm();
+void decode_acm(acm_codec_data *data, sample * outbuf, int32_t samples_to_do, int channelspacing);
 void reset_acm(VGMSTREAM *vgmstream);
-void free_acm(mus_acm_codec_data *data);
+void free_acm(acm_codec_data *data);
 
 /* nwa_decoder */
 void decode_nwa(NWAData *nwa, sample *outbuf, int32_t samples_to_do);
diff --git a/src/meta/acm.c b/src/meta/acm.c
index 1a3bd426..4f1cf6fa 100644
--- a/src/meta/acm.c
+++ b/src/meta/acm.c
@@ -6,7 +6,7 @@
 VGMSTREAM * init_vgmstream_acm(STREAMFILE *streamFile) {
     VGMSTREAM * vgmstream = NULL;
     int loop_flag = 0, channel_count, sample_rate, num_samples;
-    mus_acm_codec_data *data = NULL;
+    acm_codec_data *data = NULL;
 
 
     /* checks */
@@ -17,23 +17,13 @@ VGMSTREAM * init_vgmstream_acm(STREAMFILE *streamFile) {
 
 
     /* init decoder */
-    data = init_acm(1);
-    if (!data) goto fail;
-
-    /* open and parse the file before creating the vgmstream */
     {
-        ACMStream *acm_stream = NULL;
-        char filename[PATH_LIMIT];
+        data = init_acm(streamFile);
+        if (!data) goto fail;
 
-        streamFile->get_name(streamFile,filename,sizeof(filename));
-        if (acm_open_decoder(&acm_stream,streamFile,filename) != ACM_OK)
-            goto fail;
-
-        data->files[0] = acm_stream;
-
-        channel_count = acm_stream->info.channels;
-        sample_rate = acm_stream->info.rate;
-        num_samples = acm_stream->total_values / acm_stream->info.channels;
+        channel_count = data->file->info.channels;
+        sample_rate = data->file->info.rate;
+        num_samples = data->file->total_values / data->file->info.channels;
     }
 
 
diff --git a/src/vgmstream.c b/src/vgmstream.c
index 331341a9..8b6260f8 100644
--- a/src/vgmstream.c
+++ b/src/vgmstream.c
@@ -1791,16 +1791,11 @@ void decode_vgmstream(VGMSTREAM * vgmstream, int samples_written, int samples_to
                           vgmstream->channels);
             break;
 #endif
-        case coding_ACM: { //single ACM
-            mus_acm_codec_data *data = vgmstream->codec_data;
-            ACMStream *acm;
-
-            acm = data->files[data->current_file];
-            decode_acm(acm,
+        case coding_ACM:
+            decode_acm(vgmstream->codec_data,
                     buffer+samples_written*vgmstream->channels,
                     samples_to_do, vgmstream->channels);
             break;
-        }
         case coding_NWA0:
         case coding_NWA1:
         case coding_NWA2:
diff --git a/src/vgmstream.h b/src/vgmstream.h
index d6854032..76bf8a62 100644
--- a/src/vgmstream.h
+++ b/src/vgmstream.h
@@ -1041,20 +1041,10 @@ typedef struct {
 } atrac9_codec_data;
 #endif
 
-/* with one file this is also used for just ACM */
+/* libacm interface */
 typedef struct {
-    int file_count;
-    int current_file;
-    /* the index we return to upon loop completion */
-    int loop_start_file;
-    /* one after the index of the last file, typically
-     * will be equal to file_count */
-    int loop_end_file;
-    /* Upon exit from a loop, which file to play. */
-    /* -1 if there is no such file */
-    /*int end_file;*/
-    ACMStream **files;
-} mus_acm_codec_data;
+    ACMStream *file;
+} acm_codec_data;
 
 #define AIX_BUFFER_SIZE 0x1000
 /* AIXery */