diff --git a/src/builtin.cpp b/src/builtin.cpp
index 74a327d5f..fee008cd2 100644
--- a/src/builtin.cpp
+++ b/src/builtin.cpp
@@ -164,7 +164,7 @@ void builtin_print_help(parser_t &parser, io_streams_t &streams, const wchar_t *
     if (error_message) {
         cmd.append(escape_string(*error_message, ESCAPE_ALL));
         // If it's an error, redirect the output of __fish_print_help to stderr
-        ios.push_back(std::make_shared<io_fd_t>(STDOUT_FILENO, STDERR_FILENO, false));
+        ios.push_back(std::make_shared<io_fd_t>(STDOUT_FILENO, STDERR_FILENO));
     }
     parser.eval(cmd, ios, TOP);
     // ignore the exit status of __fish_print_help
diff --git a/src/exec.cpp b/src/exec.cpp
index 011fcf240..a7a0f214c 100644
--- a/src/exec.cpp
+++ b/src/exec.cpp
@@ -403,14 +403,12 @@ static bool exec_internal_builtin_proc(parser_t &parser, const std::shared_ptr<j
         switch (in->io_mode) {
             case io_mode_t::fd: {
                 const io_fd_t *in_fd = static_cast<const io_fd_t *>(in.get());
-                // Ignore user-supplied fd redirections from an fd other than the
+                // Ignore fd redirections from an fd other than the
                 // standard ones. e.g. in source <&3 don't actually read from fd 3,
                 // which is internal to fish. We still respect this redirection in
                 // that we pass it on as a block IO to the code that source runs,
-                // and therefore this is not an error. Non-user supplied fd
-                // redirections come about through transmogrification, and we need
-                // to respect those here.
-                if (!in_fd->user_supplied || (in_fd->old_fd >= 0 && in_fd->old_fd < 3)) {
+                // and therefore this is not an error.
+                if (in_fd->old_fd >= 0 && in_fd->old_fd < 3) {
                     local_builtin_stdin = in_fd->old_fd;
                 }
                 break;
diff --git a/src/fish_tests.cpp b/src/fish_tests.cpp
index b78898bfc..55cf42eae 100644
--- a/src/fish_tests.cpp
+++ b/src/fish_tests.cpp
@@ -2460,7 +2460,7 @@ static void test_dup2s() {
     using std::make_shared;
     io_chain_t chain;
     chain.push_back(make_shared<io_close_t>(17));
-    chain.push_back(make_shared<io_fd_t>(3, 19, true));
+    chain.push_back(make_shared<io_fd_t>(3, 19));
     auto list = dup2_list_t::resolve_chain(chain);
     do_test(list.has_value());
     do_test(list->get_actions().size() == 2);
@@ -2479,10 +2479,10 @@ static void test_dup2s_fd_for_target_fd() {
     io_chain_t chain;
     // note io_fd_t params are backwards from dup2.
     chain.push_back(make_shared<io_close_t>(10));
-    chain.push_back(make_shared<io_fd_t>(9, 10, true));
-    chain.push_back(make_shared<io_fd_t>(5, 8, true));
-    chain.push_back(make_shared<io_fd_t>(1, 4, true));
-    chain.push_back(make_shared<io_fd_t>(3, 5, true));
+    chain.push_back(make_shared<io_fd_t>(9, 10));
+    chain.push_back(make_shared<io_fd_t>(5, 8));
+    chain.push_back(make_shared<io_fd_t>(1, 4));
+    chain.push_back(make_shared<io_fd_t>(3, 5));
     auto list = dup2_list_t::resolve_chain(chain);
 
     do_test(list.has_value());
diff --git a/src/io.cpp b/src/io.cpp
index ca8648d7c..83240c19a 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -248,8 +248,7 @@ bool io_chain_t::append_from_specs(const redirection_spec_list_t &specs, const w
                     auto target_fd = spec.get_target_as_fd();
                     assert(target_fd.has_value() &&
                            "fd redirection should have been validated already");
-                    this->push_back(
-                        make_unique<io_fd_t>(spec.fd, *target_fd, true /* user supplied */));
+                    this->push_back(make_unique<io_fd_t>(spec.fd, *target_fd));
                 }
                 break;
             }
diff --git a/src/io.h b/src/io.h
index 6f569f08d..42a7edd21 100644
--- a/src/io.h
+++ b/src/io.h
@@ -200,17 +200,11 @@ class io_fd_t : public io_data_t {
     /// fd to redirect specified fd to. For example, in 2>&1, old_fd is 1, and io_data_t::fd is 2.
     const int old_fd;
 
-    /// Whether this redirection was supplied by a script. For example, 'cmd <&3' would have
-    /// user_supplied set to true. But a redirection that comes about through transmogrification
-    /// would not.
-    const bool user_supplied;
-
     void print() const override;
 
     ~io_fd_t() override;
 
-    io_fd_t(int f, int old, bool us)
-        : io_data_t(io_mode_t::fd, f), old_fd(old), user_supplied(us) {}
+    io_fd_t(int f, int old) : io_data_t(io_mode_t::fd, f), old_fd(old) {}
 };
 
 /// Represents a redirection to or from an opened file.