diff --git a/ruby/bindings/InitRubyBindings.cpp b/ruby/bindings/InitRubyBindings.cpp
index 8efb3e7811a..25e232d026e 100644
--- a/ruby/bindings/InitRubyBindings.cpp
+++ b/ruby/bindings/InitRubyBindings.cpp
@@ -471,6 +471,7 @@ def safe_puts(message=nil, opts=nil)
   end
 end
 
+require 'stringio' # TODO: remove this once json-schema version is > 3.4.0, (cf https://github.com/voxpupuli/json-schema/pull/512)
 require 'rbconfig'
 
 # require 'logger'