2 files changed, 3 insertions, 1 deletions
diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
index aff46ef61d5..15e2d5d13f2 100644
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -626,6 +626,7 @@ CheckArrayDesignatorExpr(Sema &Self, Expr *Index, llvm::APSInt &Value) {
     return Self.Diag(Loc, diag::err_array_designator_negative)
       << Value.toString(10) << Index->getSourceRange();
 
+  Value.setIsUnsigned(true);
   return false;
 }
 
diff --git a/clang/test/Sema/designated-initializers.c b/clang/test/Sema/designated-initializers.c
index 3fe5f8484c2..8f7eb8cda92 100644
--- a/clang/test/Sema/designated-initializers.c
+++ b/clang/test/Sema/designated-initializers.c
@@ -113,6 +113,7 @@ struct disklabel_ops disklabel64_ops = {
   .labelsize = sizeof(struct disklabel_ops)
 };
 
-// PR clang/3377
+// PR clang/3378
 int bitwidth[] = { [(long long int)1] = 5, [(short int)2] = 2 };
 int a[]= { [sizeof(int)] = 0 };
+int a2[]= { [0 ... sizeof(int)] = 0 };