diff --git a/NScumm.Audio/OPL/Woody/WoodyConstants.cs b/NScumm.Audio/OPL/Woody/WoodyConstants.cs
index c6f8ffc..fa195af 100644
--- a/NScumm.Audio/OPL/Woody/WoodyConstants.cs
+++ b/NScumm.Audio/OPL/Woody/WoodyConstants.cs
@@ -64,7 +64,7 @@ internal static class WoodyConstants
 
         // vibrato constants
         public const int VIBTAB_SIZE = 8;
-        public const double VIBFAC = 70 / 50000;        // no braces, integer mul/div
+        public const double VIBFAC = 70.0 / 50000.0;
 
         // tremolo constants and table
         public const int TREMTAB_SIZE = 53;