diff --git a/ArcFormats/Tmr-Hiro/ArcPAC.cs b/ArcFormats/Tmr-Hiro/ArcPAC.cs
index 4c44a3e3..f5693df6 100644
--- a/ArcFormats/Tmr-Hiro/ArcPAC.cs
+++ b/ArcFormats/Tmr-Hiro/ArcPAC.cs
@@ -101,7 +101,7 @@ namespace GameRes.Formats.TmrHiro
                     entry.Name = Path.ChangeExtension (entry.Name, "grd");
                     entry.Type = "image";
                 }
-                else if (0x44 == signature && entry.Size-9 == file.View.ReadUInt32 (entry.Offset+5))
+                else if (0x44 == (signature & 0xFF) && entry.Size-9 == file.View.ReadUInt32 (entry.Offset+5))
                 {
                     entry.Type = "audio";
                 }
diff --git a/ArcFormats/Tmr-Hiro/AudioTmr.cs b/ArcFormats/Tmr-Hiro/AudioTmr.cs
index 5a79610e..e3cd6e06 100644
--- a/ArcFormats/Tmr-Hiro/AudioTmr.cs
+++ b/ArcFormats/Tmr-Hiro/AudioTmr.cs
@@ -37,7 +37,7 @@ namespace GameRes.Formats.TmrHiro
     {
         public override string         Tag { get { return "WAV/TMR-HIRO"; } }
         public override string Description { get { return "Tmr-Hiro wave audio"; } }
-        public override uint     Signature { get { return 0x44; } }
+        public override uint     Signature { get { return 0; } }
 
         public TmrHiroAudio ()
         {
@@ -46,6 +46,8 @@ namespace GameRes.Formats.TmrHiro
 
         public override SoundInput TryOpen (Stream file)
         {
+            if (file.ReadByte() != 0x44)
+                return null;
             file.Position = 4;
             if (file.ReadByte() != 0)
                 return null;