diff --git a/include/wx/intl.h b/include/wx/intl.h
index 39296b090cec..47b699397055 100644
--- a/include/wx/intl.h
+++ b/include/wx/intl.h
@@ -360,6 +360,10 @@ class WXDLLIMPEXP_BASE wxLocale
                           const wxString& shortName,
                           bool bLoadDefault);
 
+    // Converts a grouping format string returned by localeconv()
+    // to the kind used on Windows platform
+    static wxString StandardizeGroupingString(wxString g);
+
 
     wxString       m_strLocale,       // this locale name
                    m_strShort;        // short name for the locale
diff --git a/interface/wx/numformatter.h b/interface/wx/numformatter.h
index 23aa6a193219..eed96cf7b463 100644
--- a/interface/wx/numformatter.h
+++ b/interface/wx/numformatter.h
@@ -140,6 +140,8 @@ class wxNumberFormatter
             Points to the variable receiving the grouping format string
             if it is used by the current locale. May be @NULL if only the
             function return value is needed.
+
+        @since 3.1.4
      */
     static bool GetThousandsSeparatorAndGroupingIfUsed(wxChar *sep, wxString *gr);
 
diff --git a/src/common/intl.cpp b/src/common/intl.cpp
index a86405bb2f52..7b88280c274b 100644
--- a/src/common/intl.cpp
+++ b/src/common/intl.cpp
@@ -1717,7 +1717,7 @@ wxString wxLocale::GetInfo(wxLocaleInfo index, wxLocaleCategory cat)
                 return ".";
 
             case wxLOCALE_GROUPING:
-                return "\3\0";
+                return "3;0";
 
             case wxLOCALE_SHORT_DATE_FMT:
                 return "%m/%d/%y";
@@ -1778,7 +1778,7 @@ wxString wxLocale::GetInfo(wxLocaleInfo index, wxLocaleCategory WXUNUSED(cat))
             break;
 
         case wxLOCALE_GROUPING:
-            cfstr = CFStringCreateWithCString(NULL, "\3\0", kCFStringEncodingASCII);
+            cfstr = CFStringCreateWithCString(NULL, "3;0", kCFStringEncodingASCII);
             break;
 
         case wxLOCALE_SHORT_DATE_FMT:
@@ -1911,6 +1911,32 @@ wxString GetDateFormatFromLangInfo(wxLocaleInfo index)
 
 } // anonymous namespace
 
+// Convert a grouping format string returned by localeconv() to
+// a standardized format. Our standard format is the one used on
+// Windows SGROUPING. Here we convert char sized integers to ASCII
+// characters. That is, for example '\3' becomes '3'. We also add
+// the a ';' delimiter between each number. A '\0' or a CHAR_MAX
+// signifies the end of the argument string. If the argument string
+// ends with a '\0' then we insert a '0' to the return string.
+// The return string will be NULL terminated.
+
+/* static */
+wxString wxLocale::StandardizeGroupingString(wxString g)
+{
+    wxString s = "";
+    int i;
+    for (i = 0; g[i] != '\0' && g[i] != CHAR_MAX; i++)
+    {
+        s.Append((char)((int)g[i] + (int)'0'));
+        s.Append(';');
+    }
+    if (g[i] == '\0')
+        s.Append('0');
+    else
+        s.RemoveLast();    // Remove extra ;
+    return s;
+}
+
 /* static */
 wxString wxLocale::GetInfo(wxLocaleInfo index, wxLocaleCategory cat)
 {
@@ -1943,9 +1969,9 @@ wxString wxLocale::GetInfo(wxLocaleInfo index, wxLocaleCategory cat)
 
         case wxLOCALE_GROUPING:
             if ( cat == wxLOCALE_CAT_NUMBER )
-                return lc->grouping;
+                return StandardizeGroupingString(lc->grouping);
             else if ( cat == wxLOCALE_CAT_MONEY )
-                return lc->mon_grouping;
+                return StandardizeGroupingString(lc->mon_grouping);
 
             wxFAIL_MSG( "invalid wxLocaleCategory" );
             break;
diff --git a/src/common/numformatter.cpp b/src/common/numformatter.cpp
index 426268676110..175d36d7d539 100644
--- a/src/common/numformatter.cpp
+++ b/src/common/numformatter.cpp
@@ -278,25 +278,29 @@ void wxNumberFormatter::AddThousandsSeparators(wxString& s)
     // before their start.
     const size_t start = s.find_first_of("0123456789");
 
-    // We get the grouping style from locale. This is represented by a character
-    // array where each element is the number of digits in a group starting
-    // from the right of the number. If the last element in the grouping is a 0
-    // then the last but one element is the number used for grouping the
-    // remaining digits. If the last element is CHAR_MAX then no grouping is
-    // done for the remaining digits.
+    // We get the grouping style from locale. This is represented by a ';'
+    // delimited character array where each element is the number of digits
+    // in a group starting from the right of the number. If the last element
+    // in the grouping is a 0 then the last but one element is the number
+    // used for grouping the remaining digits.
 
     size_t i = 0;
-    while((grouping[i] != '\0') && (grouping[i] != CHAR_MAX) && (pos > start + (size_t)grouping[i]))
+    while((grouping[i] != '\0') && (grouping[i] != '0'))
     {
-        pos -= (size_t)grouping[i];
-        s.insert(pos, thousandsSep);
+        if (grouping[i] != ';')
+        {
+            if (pos <= start + (size_t)(grouping[i] - '0'))
+                break;
+            pos -= (size_t)(grouping[i] - '0');
+            s.insert(pos, thousandsSep);
+        }
         i++;
     }
-    if ( grouping[i] == '\0' && i > 0 )
+    if ( grouping[i] == '0' && i > 0 )
     {
-        while ( pos > start + (size_t)grouping[i - 1] )
+        while ( pos > start + (size_t)(grouping[i - 2] - '0'))
         {
-            pos -= (size_t)grouping[i - 1];
+            pos -= (size_t)(grouping[i - 2] - '0');
             s.insert(pos, thousandsSep);
         }
     }