diff --git a/package/ruby/ruby.mk b/package/ruby/ruby.mk
index 34da13d64a..e633ee44f9 100644
--- a/package/ruby/ruby.mk
+++ b/package/ruby/ruby.mk
@@ -30,6 +30,9 @@ RUBY_CONF_ENV = CFLAGS="$(RUBY_CFLAGS)"
 
 ifeq ($(BR2_bfin),y)
 RUBY_CONF_ENV = ac_cv_func_dl_iterate_phdr=no
+# Blackfin doesn't have FFI closure support, needed by the fiddle
+# extension.
+RUBY_CONF_OPTS += --with-out-ext=fiddle
 endif
 
 # Force optionals to build before we do