diff --git a/src/V3Fork.cpp b/src/V3Fork.cpp
index 2e40faa24..c6f6b09d2 100644
--- a/src/V3Fork.cpp
+++ b/src/V3Fork.cpp
@@ -449,13 +449,7 @@ class DynScopeVisitor final : public VNVisitor {
                         << nodep->varp()->verilogKwd()
                         << " variable of a function after a timing control is not allowed");
                 } else {
-                    nodep->v3warn(E_UNSUPPORTED, "Unsupported: Writing to a captured "
-                                                     << nodep->varp()->verilogKwd()
-                                                     << " variable in a "
-                                                     << (VN_IS(nodep->backp(), AssignDly)
-                                                             ? "non-blocking assignment"
-                                                             : "fork")
-                                                     << " after a timing control");
+                    UASSERT_OBJ(nodep->varp()->lifetime().isAutomatic(), nodep, "writing to an automatic variable after a timing control");
                 }
             }
             if (!framep->instance().initialized()) framep->createInstancePrototype();
diff --git a/src/V3LinkParse.cpp b/src/V3LinkParse.cpp
index 4e238c75f..ee2351a24 100644
--- a/src/V3LinkParse.cpp
+++ b/src/V3LinkParse.cpp
@@ -382,7 +382,11 @@ class LinkParseVisitor final : public VNVisitor {
                 }
             }
         } else if (m_ftaskp) {
-            if (!nodep->lifetime().isAutomatic()) nodep->lifetime(VLifetime::AUTOMATIC_IMPLICIT);
+            if (m_ftaskp->existsAndNext([&](const AstNode* nodep) {return nodep->isTimingControl();})) {
+                nodep->lifetime(VLifetime::STATIC_IMPLICIT);
+            } else {
+                nodep->lifetime(VLifetime::AUTOMATIC_IMPLICIT);
+            }
         } else if (nodep->lifetime().isNone()) {
             // lifetime shouldn't be unknown, set static if none
             nodep->lifetime(VLifetime::STATIC_IMPLICIT);