diff --git a/svd-parser/src/expand.rs b/svd-parser/src/expand.rs
index 1f400c0..e8acc7a 100644
--- a/svd-parser/src/expand.rs
+++ b/svd-parser/src/expand.rs
@@ -128,7 +128,12 @@ impl FieldPath {
         let name = v.pop().unwrap();
         let register = if !v.is_empty() {
             let (block, rname) = RegisterPath::parse_vec(v);
-            Some(RegisterPath::new(block.unwrap(), rname))
+            Some(RegisterPath::new(
+                block.expect(&format!(
+                    "Full qualifying field path is expected. Passed: {v:?}"
+                )),
+                rname,
+            ))
         } else {
             None
         };