diff --git a/enzyme/Enzyme/MLIR/Passes/RemoveUnusedEnzymeOps.cpp b/enzyme/Enzyme/MLIR/Passes/RemoveUnusedEnzymeOps.cpp
index 5ced93e86512..d478380f1df0 100644
--- a/enzyme/Enzyme/MLIR/Passes/RemoveUnusedEnzymeOps.cpp
+++ b/enzyme/Enzyme/MLIR/Passes/RemoveUnusedEnzymeOps.cpp
@@ -35,6 +35,7 @@ namespace {
 // check before end.
 bool mayExecuteBefore(Block *blk, Operation *check, Operation *end) {
   auto reg = blk->getParent();
+  (void)reg;
   assert(reg->isAncestor(end->getParentRegion()));
 
   DenseSet<Block *> visitedBlocks;