diff --git a/proto/decode.go b/proto/decode.go
index d8b9187..b712786 100644
--- a/proto/decode.go
+++ b/proto/decode.go
@@ -124,7 +124,7 @@
 		if fd == nil && md.ExtensionRanges().Has(num) {
 			extType, err := o.Resolver.FindExtensionByNumber(md.FullName(), num)
 			if err != nil && err != protoregistry.NotFound {
-				return err
+				return errors.New("%v: unable to resolve extension %v: %v", md.FullName(), num, err)
 			}
 			if extType != nil {
 				fd = extType.TypeDescriptor()