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-rw-r--r--lib/Core/TimingSolver.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Core/TimingSolver.cpp b/lib/Core/TimingSolver.cpp
index 0154ddcf..542a3c8e 100644
--- a/lib/Core/TimingSolver.cpp
+++ b/lib/Core/TimingSolver.cpp
@@ -72,7 +72,7 @@ bool TimingSolver::mustBeTrue(const ExecutionState& state, ref<Expr> expr,
 
 bool TimingSolver::mustBeFalse(const ExecutionState& state, ref<Expr> expr,
                                bool &result) {
-  return mustBeTrue(state, Expr::createNot(expr), result);
+  return mustBeTrue(state, Expr::createIsZero(expr), result);
 }
 
 bool TimingSolver::mayBeTrue(const ExecutionState& state, ref<Expr> expr,