diff --git a/include/phasar/DataFlow/Mono/Contexts/CallStringCTX.h b/include/phasar/DataFlow/Mono/Contexts/CallStringCTX.h
index 2e835c6f56..098c4ff217 100644
--- a/include/phasar/DataFlow/Mono/Contexts/CallStringCTX.h
+++ b/include/phasar/DataFlow/Mono/Contexts/CallStringCTX.h
@@ -65,7 +65,7 @@ template <typename N, unsigned K> class CallStringCTX {
 
   friend bool operator<(const CallStringCTX<N, K> &Lhs,
                         const CallStringCTX<N, K> &Rhs) {
-    return Lhs.cs < Rhs.cs;
+    return Lhs.CallString < Rhs.CallString;
   }
 
   llvm::raw_ostream &print(llvm::raw_ostream &OS) const {