diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 1451fd111953..699d81715e3c 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -3197,6 +3197,7 @@ bool IntExprEvaluator::VisitCastExpr(const CastExpr *E) {
       if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType))
         return false;
 
+      LV.Designator.setInvalid();
       LV.moveInto(Result);
       return true;
     }
diff --git a/clang/test/Sema/const-eval.c b/clang/test/Sema/const-eval.c
index 632457da0916..094d1ce71608 100644
--- a/clang/test/Sema/const-eval.c
+++ b/clang/test/Sema/const-eval.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify -triple i686-linux %s
 
 #define EVAL_EXPR(testno, expr) int test##testno = sizeof(struct{char qq[expr];});
 int x;
@@ -105,3 +105,6 @@ int weak_int_test = weak_int; // expected-error {{not a compile-time constant}}
 
 int literalVsNull1 = "foo" == 0;
 int literalVsNull2 = 0 == "foo";
+
+// PR11385.
+int castViaInt[*(int*)(unsigned long)"test"]; // expected-error {{variable length array}}