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-rw-r--r--lib/Solver/CexCachingSolver.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Solver/CexCachingSolver.cpp b/lib/Solver/CexCachingSolver.cpp
index f4ee009c..7c977a57 100644
--- a/lib/Solver/CexCachingSolver.cpp
+++ b/lib/Solver/CexCachingSolver.cpp
@@ -51,7 +51,7 @@ namespace {
 typedef std::set< ref<Expr> > KeyType;
 
 struct AssignmentLessThan {
-  bool operator()(const Assignment *a, const Assignment *b) {
+  bool operator()(const Assignment *a, const Assignment *b) const {
     return a->bindings < b->bindings;
   }
 };