diff --git a/src/common/fmapbase.cpp b/src/common/fmapbase.cpp
index 24ace1c214..e86e8b4902 100644
--- a/src/common/fmapbase.cpp
+++ b/src/common/fmapbase.cpp
@@ -605,6 +605,10 @@ wxFontMapperBase::NonInteractiveCharsetToEncoding(const wxString& charset)
 
                     switch ( value )
                     {
+                        case 866:
+                            encoding = wxFONTENCODING_CP866;
+                            break;
+
                         case 874:
                             encoding = wxFONTENCODING_CP874;
                             break;