diff --git a/lib/Analysis/RegionStore.cpp b/lib/Analysis/RegionStore.cpp
index 747b16d..e2dd176 100644
--- a/lib/Analysis/RegionStore.cpp
+++ b/lib/Analysis/RegionStore.cpp
@@ -262,7 +262,8 @@
     if (CI2->getValue().isUnsigned() ||
         CI2->getValue().getBitWidth() < CI1->getValue().getBitWidth()) {
       llvm::APSInt SI = CI2->getValue();
-      SI.extend(CI1->getValue().getBitWidth());
+      if (CI2->getValue().getBitWidth() < CI1->getValue().getBitWidth())
+        SI.extend(CI1->getValue().getBitWidth());
       SI.setIsSigned(true);
       SignedInt = nonloc::ConcreteInt(getBasicVals().getValue(SI));
       CI2 = cast<nonloc::ConcreteInt>(&SignedInt);