diff --git a/docs/feedback/VDE-016.md b/docs/feedback/VDE-016.md
index 8927806..082465c 100644
--- a/docs/feedback/VDE-016.md
+++ b/docs/feedback/VDE-016.md
@@ -1,6 +1,6 @@
 ---
 id: VDE-016
-status: open
+status: fixed
 severity: critical
 category: bug
 date: 2026-07-27
diff --git a/src/brep/ssi_boolean.cpp b/src/brep/ssi_boolean.cpp
index 9693f57..a7b1737 100644
--- a/src/brep/ssi_boolean.cpp
+++ b/src/brep/ssi_boolean.cpp
@@ -54,6 +54,9 @@ struct SSICurveData {
 };
 
 namespace {
+// GCC two-phase lookup: bring enclosing namespace types into scope
+using vde::brep::SSICurveData;
+using vde::brep::ClassResult;
 
 // ═══════════════════════════════════════════════════════════
 //  Constants & types