--- a/runtime/ftplugin/ada.vim
+++ b/runtime/ftplugin/ada.vim
@@ -126,9 +126,11 @@
    endif
 endif
 
-if ! exists("current_compiler")			||
-   \ current_compiler != g:ada_default_compiler
-   execute "compiler " . g:ada_default_compiler
+if exists("g:ada_default_compiler")
+   if ! exists("current_compiler")  ||
+	 \ current_compiler != g:ada_default_compiler
+      execute "compiler " . g:ada_default_compiler
+   endif
 endif
 
 " Section: Folding {{{1