diff --git a/aegisub/aegisublocale.cpp b/aegisub/aegisublocale.cpp
index d76230b2d..4323c8da7 100644
--- a/aegisub/aegisublocale.cpp
+++ b/aegisub/aegisublocale.cpp
@@ -46,7 +46,7 @@
 #include <wx/choicdlg.h>
 #include "aegisublocale.h"
 #include "standard_paths.h"
-
+#include <wx/stdpaths.h>
 
 ///////////////
 // Constructor
@@ -150,6 +150,7 @@ wxArrayInt AegisubLocale::GetAvailableLanguages() {
 		_T("fr_FR"),
 		_T("hu"),
 		_T("it"),
+		_T("ja"),
 		_T("ko"),
 		_T("ru"),
 		_T("pt_BR"),
@@ -159,9 +160,12 @@ wxArrayInt AegisubLocale::GetAvailableLanguages() {
 	size_t len = sizeof(langs)/sizeof(wchar_t*);
 	for (size_t i=0; i<len; i++) {
 		const wxLanguageInfo *lang = wxLocale::FindLanguageInfo(langs[i]);
-		if (lang) final.Add(lang->Language);
-	}
 
+		// If the locale file doesn't exist then don't list it as an option. 
+		wxString locDir = wxStandardPaths::Get().GetLocalizedResourcesDir(langs[i], wxStandardPathsBase::ResourceCat_Messages);
+		wxFileName file(wxString::Format(_T("%s/%s.mo"), locDir.c_str(), _T(GETTEXT_PACKAGE)));
+		if (lang && file.FileExists()) final.Add(lang->Language);
+	}
 #endif
 
 	return final;