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-rw-r--r--ext/bigdecimal/lib/bigdecimal/jacobian.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/bigdecimal/lib/bigdecimal/jacobian.rb b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
index 9cad06c09b5..84c50248b70 100644
--- a/ext/bigdecimal/lib/bigdecimal/jacobian.rb
+++ b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
@@ -21,6 +21,9 @@
#
# fx is f.values(x).
#
+
+require 'bigdecimal'
+
module Jacobian
module_function