diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
@@ -405,7 +405,7 @@
     if (const NamedDecl *context_named_decl = dyn_cast<NamedDecl>(context_decl))
       LLDB_LOG(log,
                "FindExternalLexicalDecls on (ASTContext*){0} '{1}' in "
-               "'{2}' (%sDecl*){3}",
+               "'{2}' ({3}Decl*){4}",
                m_ast_context, m_clang_ast_context->getDisplayName(),
                context_named_decl->getNameAsString().c_str(),
                context_decl->getDeclKindName(),