diff --git a/src/common/mimecmn.cpp b/src/common/mimecmn.cpp
index 680d57fc28..43de8ee906 100644
--- a/src/common/mimecmn.cpp
+++ b/src/common/mimecmn.cpp
@@ -527,6 +527,8 @@ wxMimeTypesManager::~wxMimeTypesManager()
 
 bool wxMimeTypesManager::Unassociate(wxFileType *ft)
 {
+    EnsureImpl();
+
 #if defined(__UNIX__) && !defined(__CYGWIN__) && !defined(__WINE__)
     return m_impl->Unassociate(ft);
 #else
diff --git a/src/unix/mimetype.cpp b/src/unix/mimetype.cpp
index 0dc66b58f8..55385d3a76 100644
--- a/src/unix/mimetype.cpp
+++ b/src/unix/mimetype.cpp
@@ -2643,6 +2643,8 @@ size_t wxMimeTypesManagerImpl::EnumAllFileTypes(wxArrayString& mimetypes)
 
 bool wxMimeTypesManagerImpl::Unassociate(wxFileType *ft)
 {
+    InitIfNeeded();
+
     wxArrayString sMimeTypes;
     ft->GetMimeTypes(sMimeTypes);