diff --git a/source/analysis/AnalyzedAssertion.cpp b/source/analysis/AnalyzedAssertion.cpp
index 67997295a..abab7381c 100644
--- a/source/analysis/AnalyzedAssertion.cpp
+++ b/source/analysis/AnalyzedAssertion.cpp
@@ -298,7 +298,7 @@ struct ClockVisitor {
     }
 
     VisitResult visit(const DisableIffAssertionExpr& expr, Clock outerClock, bitmask<VF> flags) {
-        return expr.visit(*this, outerClock, flags);
+        return expr.expr.visit(*this, outerClock, flags);
     }
 
 private: