diff --git a/enzyme/tools/enzyme-tblgen/enzyme-tblgen.cpp b/enzyme/tools/enzyme-tblgen/enzyme-tblgen.cpp
index 1a0ac9ac744..d9b77735753 100644
--- a/enzyme/tools/enzyme-tblgen/enzyme-tblgen.cpp
+++ b/enzyme/tools/enzyme-tblgen/enzyme-tblgen.cpp
@@ -1166,9 +1166,27 @@ void handleUse(
   bool usesShadow = Def->getValueAsBit("usesShadow");
   bool usesCustom = Def->getValueAsBit("usesCustom");
 
-  // We don't handle any custom primal/shadow
-  (void)usesCustom;
-  assert(!usesCustom);
+  // This only concerns instances of StaticSelect for now
+  if (usesCustom) {
+    auto numArgs = resultTree->getNumArgs();
+
+    for (int i = numArgs == 3; i < numArgs; ++i) {
+      std::string foundPrimalUse2 = "";
+      std::string foundShadowUse2 = "";
+
+      bool foundDiffRet2 = false;
+
+      auto name = resultTree->getArgNameStr(i);
+      auto arg = resultTree->getArg(i);
+      auto arg2 = dyn_cast<DagInit>(arg);
+      handleUse(root, arg2, name.size() ? foundPrimalUse2 : foundPrimalUse,
+                name.size() ? foundShadowUse2 : foundShadowUse,
+                name.size() ? foundDiffRet2 : foundDiffRet,
+                usesPrimal ? precondition : "", tree, varNameToCondition);
+    }
+
+    return;
+  }
 
   for (auto argEn : llvm::enumerate(resultTree->getArgs())) {
     auto name = resultTree->getArgNameStr(argEn.index());