diff --git a/docs/doxygen/mainpages/const_cpp.h b/docs/doxygen/mainpages/const_cpp.h
index 9c982c3323..5a1df738de 100644
--- a/docs/doxygen/mainpages/const_cpp.h
+++ b/docs/doxygen/mainpages/const_cpp.h
@@ -168,6 +168,10 @@ Currently the following symbols exist:
     implemented in a generic way, using a critical section.}
 @itemdef{wxHAS_BITMAPTOGGLEBUTTON, Defined in @c wx/tglbtn.h if
     wxBitmapToggleButton class is available in addition to wxToggleButton.}
+@itemdef{wxHAS_CONFIG_AS_FILECONFIG, Defined if wxConfig is defined as
+    wxFileConfig. This constant is available since wxWidgets 3.3.0.}
+@itemdef{wxHAS_CONFIG_AS_REGCONFIG, Defined if wxConfig is defined as
+    wxRegConfig. This constant is available since wxWidgets 3.3.0.}
 @itemdef{wxHAS_CONFIG_TEMPLATE_RW, Defined if the currently used compiler
     supports template Read() and Write() methods in wxConfig.}
 @itemdef{wxHAS_DEPRECATED_ATTR, Defined if C++14 @c [[deprecated]] attribute is
diff --git a/include/wx/config.h b/include/wx/config.h
index 177665116d..9a47bdedb4 100644
--- a/include/wx/config.h
+++ b/include/wx/config.h
@@ -23,9 +23,11 @@
 #if defined(__WINDOWS__) && wxUSE_CONFIG_NATIVE
     #include "wx/msw/regconf.h"
     #define wxConfig  wxRegConfig
+    #define wxHAS_CONFIG_AS_REGCONFIG
 #else // either we're under Unix or wish to always use config files
     #include "wx/fileconf.h"
     #define wxConfig wxFileConfig
+    #define wxHAS_CONFIG_AS_FILECONFIG
 #endif
 
 #endif // wxUSE_CONFIG
diff --git a/interface/wx/config.h b/interface/wx/config.h
index 3e86aa9434..3be4368c66 100644
--- a/interface/wx/config.h
+++ b/interface/wx/config.h
@@ -57,7 +57,9 @@ enum
     with the registry under Windows or text-based config files under Unix.
     To make writing the portable code even easier, wxWidgets provides a typedef
     wxConfig which is mapped onto the native wxConfigBase implementation on the
-    given platform: i.e. wxRegConfig under Windows and wxFileConfig otherwise.
+    given platform: i.e. wxRegConfig under Windows (in this case
+    `wxHAS_CONFIG_AS_REGCONFIG` preprocessor symbol is defined) and
+    wxFileConfig otherwise (in this case `wxHAS_CONFIG_AS_FILECONFIG` is).
 
     See @ref overview_config for a description of all features of this class.
 
diff --git a/src/common/config.cpp b/src/common/config.cpp
index fb29b8538d..7a2765636f 100644
--- a/src/common/config.cpp
+++ b/src/common/config.cpp
@@ -56,12 +56,13 @@ bool          wxConfigBase::ms_bAutoCreate = true;
 
 wxConfigBase *wxAppTraitsBase::CreateConfig()
 {
-    return new
-    #if defined(__WINDOWS__) && wxUSE_CONFIG_NATIVE
-        wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
-    #else // either we're under Unix or wish to use files even under Windows
-        wxFileConfig(wxTheApp->GetAppName());
-    #endif
+#if defined(wxHAS_CONFIG_AS_REGCONFIG)
+    return new wxRegConfig(wxTheApp->GetAppName(), wxTheApp->GetVendorName());
+#elif defined(wxHAS_CONFIG_AS_FILECONFIG)
+    return new wxFileConfig(wxTheApp->GetAppName());
+#else
+    #error No wxConfig implementation defined.
+#endif
 }
 
 // ----------------------------------------------------------------------------