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-rw-r--r--theories/Program/Wf.v1
1 files changed, 1 insertions, 0 deletions
diff --git a/theories/Program/Wf.v b/theories/Program/Wf.v
index c490ea516..6e51f6187 100644
--- a/theories/Program/Wf.v
+++ b/theories/Program/Wf.v
@@ -69,6 +69,7 @@ Section Well_founded.
End Well_founded.
+Require Coq.extraction.Extraction.
Extraction Inline Fix_F_sub Fix_sub.
Set Implicit Arguments.