diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index f2c7a812c..4183199ec 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -150,9 +150,7 @@ Improved terminal support
 - Fish now sets the terminal window title (via OSC 0) unconditionally instead of only for some terminals (:issue:`10037`).
 - Fish now marks the prompt and command-output regions (via OSC 133) to enable terminal shell integration (:issue:`10352`).
   Shell integration shortcuts can scroll to the next/previous prompt or show the last command output in a pager.
-- Focus reporting is enabled unconditionally, not just inside tmux.
-  To use it, define functions that handle events ``fish_focus_in`` and ``fish_focus_out``.
-- Focus reporting is no longer disabled on the first prompt.
+- Focus reporting in tmux is no longer disabled on the first prompt.
 
 Other improvements
 ------------------
diff --git a/src/input_common.rs b/src/input_common.rs
index 465bf8301..e32576d73 100644
--- a/src/input_common.rs
+++ b/src/input_common.rs
@@ -7,6 +7,7 @@ use crate::common::{
 use crate::env::{EnvStack, Environment};
 use crate::fd_readable_set::FdReadableSet;
 use crate::flog::FLOG;
+use crate::global_safety::RelaxedAtomicBool;
 use crate::input::KeyNameStyle;
 use crate::key::{
     self, alt, canonicalize_control_char, canonicalize_keyed_control_char, function_key, shift,
@@ -515,7 +516,12 @@ fn terminal_protocols_disable_impl() {
     let _ = write_to_fd(sequences.as_bytes(), STDOUT_FILENO);
 }
 
+pub(crate) static IS_TMUX: RelaxedAtomicBool = RelaxedAtomicBool::new(false);
+
 pub(crate) fn focus_events_enable_ifn() {
+    if !IS_TMUX.load() {
+        return;
+    }
     let mut term_protocols = TERMINAL_PROTOCOLS.get().borrow_mut();
     let Some(term_protocols) = term_protocols.as_mut() else {
         panic!()
diff --git a/src/reader.rs b/src/reader.rs
index 4bce967db..2dd358ac4 100644
--- a/src/reader.rs
+++ b/src/reader.rs
@@ -71,6 +71,7 @@ use crate::history::{
 };
 use crate::input::init_input;
 use crate::input::Inputter;
+use crate::input_common::IS_TMUX;
 use crate::input_common::{
     focus_events_enable_ifn, terminal_protocols_enable_scoped, CharEvent, CharInputStyle,
     ReadlineCmd,
@@ -3660,6 +3661,8 @@ fn reader_interactive_init(parser: &Parser) {
     parser
         .vars()
         .set_one(L!("_"), EnvMode::GLOBAL, L!("fish").to_owned());
+
+    IS_TMUX.store(parser.vars().get_unless_empty(L!("TMUX")).is_some());
 }
 
 /// Destroy data for interactive use.
diff --git a/tests/pexpects/read.py b/tests/pexpects/read.py
index 952065ef6..6488df56c 100644
--- a/tests/pexpects/read.py
+++ b/tests/pexpects/read.py
@@ -13,7 +13,7 @@ send, sendline, sleep, expect_prompt, expect_re, expect_str = (
 
 
 def expect_read_prompt():
-    expect_re(r"\r\n?read> \x1b\[\?1004h$")
+    expect_re(r"\r\n?read> (\x1b\[\?1004h)?$")
 
 
 def expect_marker(text):
@@ -56,12 +56,12 @@ print_var_contents("foo", "bar")
 
 # read -c (see #8633)
 sendline(r"read -c init_text somevar && echo $somevar")
-expect_re(r"\r\n?read> init_text\x1b\[\?1004h$")
+expect_re(r"\r\n?read> init_text(\x1b\[\?1004h)?$")
 sendline("someval")
 expect_prompt("someval\r\n")
 
 sendline(r"read --command='some other text' somevar && echo $somevar")
-expect_re(r"\r\n?read> some other text\x1b\[\?1004h$")
+expect_re(r"\r\n?read> some other text(\x1b\[\?1004h)?$")
 sendline("another value")
 expect_prompt("another value\r\n")
 
diff --git a/tests/pexpects/signals.py b/tests/pexpects/signals.py
index ef3ea1c69..7c03be3f9 100644
--- a/tests/pexpects/signals.py
+++ b/tests/pexpects/signals.py
@@ -47,7 +47,7 @@ expect_prompt()
 sendline("function postexec --on-event fish_postexec; echo fish_postexec spotted; end")
 expect_prompt()
 sendline("read")
-expect_re(r"\r\n?read> \x1b\[\?1004h$")
+expect_re(r"\r\n?read> (\x1b\[\?1004h)?$")
 sleep(0.200)
 os.kill(sp.spawn.pid, signal.SIGINT)
 expect_str("fish_postexec spotted")