1 files changed, 3 insertions, 1 deletions
diff --git a/source/slang/slang-check-decl.cpp b/source/slang/slang-check-decl.cpp
index 7c36bdd5f..98a2b18a1 100644
--- a/source/slang/slang-check-decl.cpp
+++ b/source/slang/slang-check-decl.cpp
@@ -6630,7 +6630,9 @@ namespace Slang
 
             if (!TryUnifyTypes(constraints, extDecl->targetType.Ptr(), type))
                 return DeclRef<ExtensionDecl>();
-            auto solvedDeclRef = trySolveConstraintSystem(&constraints, makeDeclRef(extGenericDecl), ArrayView<Val*>());
+
+            ConversionCost baseCost;
+            auto solvedDeclRef = trySolveConstraintSystem(&constraints, makeDeclRef(extGenericDecl), ArrayView<Val*>(), baseCost);
             if (!solvedDeclRef)
             {
                 return DeclRef<ExtensionDecl>();