diff --git a/clang/Analysis/GRSimpleVals.cpp b/clang/Analysis/GRSimpleVals.cpp
index 447eb44..a2711c7 100644
--- a/clang/Analysis/GRSimpleVals.cpp
+++ b/clang/Analysis/GRSimpleVals.cpp
@@ -56,4 +56,26 @@
   V.extOrTrunc(ValMgr.getContext().getTypeSize(T, CastExpr->getLocStart()));
 
   return nonlval::ConcreteInt(ValMgr.getValue(V));
-}
\ No newline at end of file
+}
+
+// Unary operators.
+
+NonLValue GRSimpleVals::EvalMinus(ValueManager& ValMgr, UnaryOperator* U,
+                                  NonLValue X) {
+  
+  switch (X.getSubKind()) {
+    case nonlval::ConcreteIntKind:
+      return cast<nonlval::ConcreteInt>(X).EvalMinus(ValMgr, U);
+    default:
+      return cast<NonLValue>(UnknownVal());
+  }
+}
+
+NonLValue GRSimpleVals::EvalComplement(ValueManager& ValMgr, NonLValue X) {
+  switch (X.getSubKind()) {
+    case nonlval::ConcreteIntKind:
+      return cast<nonlval::ConcreteInt>(X).EvalComplement(ValMgr);
+    default:
+      return cast<NonLValue>(UnknownVal());
+  }
+}