diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index a7910aa28e2f..613fb73c9524 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -3724,6 +3724,7 @@ Sema::ActOnCUDAExecConfigExpr(Scope *S, SourceLocation LLLLoc,
 
   DeclRefExpr *ConfigDR = new (Context) DeclRefExpr(
       ConfigDecl, ConfigQTy, VK_LValue, LLLLoc);
+  MarkDeclarationReferenced(LLLLoc, ConfigDecl);
 
   return ActOnCallExpr(S, ConfigDR, LLLLoc, ExecConfig, GGGLoc, 0,
                        /*IsExecConfig=*/true);