diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index dfba3508e0e..71754fdac4b 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -221,7 +221,7 @@ ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : ConstantIntegral(Ty, V) {
 
 ConstantSInt::ConstantSInt(const Type *Ty, int64_t V) : ConstantInt(Ty, V) {
   assert(Ty->isInteger() && Ty->isSigned() &&
-         "Illegal type for unsigned integer constant!");
+         "Illegal type for signed integer constant!");
   assert(isValueValidForType(Ty, V) && "Value too large for type!");
 }