diff --git a/include/wx/propgrid/propgrid.h b/include/wx/propgrid/propgrid.h
index d8b3675531..2a6d719ed0 100644
--- a/include/wx/propgrid/propgrid.h
+++ b/include/wx/propgrid/propgrid.h
@@ -76,13 +76,23 @@ public:
 
     wxPGChoices         m_boolChoices;
 
+    // Some shared variants
+#if WXWIN_COMPATIBILITY_3_0
     wxVariant           m_vEmptyString;
     wxVariant           m_vZero;
     wxVariant           m_vMinusOne;
     wxVariant           m_vTrue;
     wxVariant           m_vFalse;
+#else
+    const wxVariant     m_vEmptyString;
+    const wxVariant     m_vZero;
+    const wxVariant     m_vMinusOne;
+    const wxVariant     m_vTrue;
+    const wxVariant     m_vFalse;
+#endif // WXWIN_COMPATIBILITY_3_0
 
     // Cached constant strings
+#if WXWIN_COMPATIBILITY_3_0
     wxPGCachedString    m_strstring;
     wxPGCachedString    m_strlong;
     wxPGCachedString    m_strbool;
@@ -93,6 +103,19 @@ public:
     wxPGCachedString    m_strMax;
     wxPGCachedString    m_strUnits;
     wxPGCachedString    m_strHint;
+#else
+    const wxString      m_strstring;
+    const wxString      m_strlong;
+    const wxString      m_strbool;
+    const wxString      m_strlist;
+
+    const wxString      m_strDefaultValue;
+    const wxString      m_strMin;
+    const wxString      m_strMax;
+    const wxString      m_strUnits;
+    const wxString      m_strHint;
+#endif // WXWIN_COMPATIBILITY_3_0
+
 #if wxPG_COMPATIBILITY_1_4
     wxPGCachedString    m_strInlineHelp;
 #endif
diff --git a/include/wx/propgrid/propgriddefs.h b/include/wx/propgrid/propgriddefs.h
index d48bd8757f..02221c1b76 100644
--- a/include/wx/propgrid/propgriddefs.h
+++ b/include/wx/propgrid/propgriddefs.h
@@ -279,8 +279,9 @@ typedef int (*wxPGSortCallback)(wxPropertyGrid* propGrid,
                                 wxPGProperty* p2);
 
 
-
+#if WXWIN_COMPATIBILITY_3_0
 typedef wxString wxPGCachedString;
+#endif
 
 /** @}
 */
diff --git a/src/propgrid/propgrid.cpp b/src/propgrid/propgrid.cpp
index 59941d159b..3d8ee2612c 100644
--- a/src/propgrid/propgrid.cpp
+++ b/src/propgrid/propgrid.cpp
@@ -182,6 +182,25 @@ wxPGGlobalVarsClass* wxPGGlobalVars = NULL;
 
 
 wxPGGlobalVarsClass::wxPGGlobalVarsClass()
+    // Prepare some shared variants
+    : m_vEmptyString(wxString())
+    , m_vZero((long)0)
+    , m_vMinusOne((long)-1)
+    , m_vTrue(true)
+    , m_vFalse(false)
+    // Prepare cached string constants
+    , m_strstring(wxS("string"))
+    , m_strlong(wxS("long"))
+    , m_strbool(wxS("bool"))
+    , m_strlist(wxS("list"))
+    , m_strDefaultValue(wxS("DefaultValue"))
+    , m_strMin(wxS("Min"))
+    , m_strMax(wxS("Max"))
+    , m_strUnits(wxS("Units"))
+    , m_strHint(wxS("Hint"))
+#if wxPG_COMPATIBILITY_1_4
+    , m_strInlineHelp(wxS("InlineHelp"))
+#endif
 {
     wxPGProperty::sm_wxPG_LABEL = new wxString(wxPG_LABEL_STRING);
 
@@ -198,29 +217,6 @@ wxPGGlobalVarsClass::wxPGGlobalVarsClass()
 
     m_extraStyle = 0;
 
-    wxVariant v;
-
-    // Prepare some shared variants
-    m_vEmptyString = wxString();
-    m_vZero = (long) 0;
-    m_vMinusOne = (long) -1;
-    m_vTrue = true;
-    m_vFalse = false;
-
-    // Prepare cached string constants
-    m_strstring = wxS("string");
-    m_strlong = wxS("long");
-    m_strbool = wxS("bool");
-    m_strlist = wxS("list");
-    m_strDefaultValue = wxS("DefaultValue");
-    m_strMin = wxS("Min");
-    m_strMax = wxS("Max");
-    m_strUnits = wxS("Units");
-    m_strHint = wxS("Hint");
-#if wxPG_COMPATIBILITY_1_4
-    m_strInlineHelp = wxS("InlineHelp");
-#endif
-
     m_warnings = 0;
 }