diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 8b04bafcda5..be734a9ba52 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -178,6 +178,7 @@
 #![feature(ip)]
 #![feature(ip_bits)]
 #![feature(is_ascii_octdigit)]
+#![feature(isqrt)]
 #![feature(maybe_uninit_uninit_array)]
 #![feature(ptr_alignment_type)]
 #![feature(ptr_metadata)]
diff --git a/library/core/src/num/int_macros.rs b/library/core/src/num/int_macros.rs
index 8bc82b5fc88..d1fe8b55cc1 100644
--- a/library/core/src/num/int_macros.rs
+++ b/library/core/src/num/int_macros.rs
@@ -906,10 +906,11 @@ macro_rules! int_impl {
         ///
         /// Basic usage:
         /// ```
+        /// #![feature(isqrt)]
         #[doc = concat!("assert_eq!(10", stringify!($SelfT), ".checked_isqrt(), Some(3));")]
         /// ```
-        #[stable(feature = "isqrt", since = "1.73.0")]
-        #[rustc_const_stable(feature = "isqrt", since = "1.73.0")]
+        #[unstable(feature = "isqrt", issue = "none")]
+        #[rustc_const_unstable(feature = "isqrt", issue = "none")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -2094,10 +2095,11 @@ macro_rules! int_impl {
         ///
         /// Basic usage:
         /// ```
+        /// #![feature(isqrt)]
         #[doc = concat!("assert_eq!(10", stringify!($SelfT), ".isqrt(), 3);")]
         /// ```
-        #[stable(feature = "isqrt", since = "1.73.0")]
-        #[rustc_const_stable(feature = "isqrt", since = "1.73.0")]
+        #[unstable(feature = "isqrt", issue = "none")]
+        #[rustc_const_unstable(feature = "isqrt", issue = "none")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index b232d5d50cb..5de672d5d7e 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -1985,10 +1985,11 @@ macro_rules! uint_impl {
         ///
         /// Basic usage:
         /// ```
+        /// #![feature(isqrt)]
         #[doc = concat!("assert_eq!(10", stringify!($SelfT), ".isqrt(), 3);")]
         /// ```
-        #[stable(feature = "isqrt", since = "1.73.0")]
-        #[rustc_const_stable(feature = "isqrt", since = "1.73.0")]
+        #[unstable(feature = "isqrt", issue = "none")]
+        #[rustc_const_unstable(feature = "isqrt", issue = "none")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
diff --git a/library/core/tests/lib.rs b/library/core/tests/lib.rs
index 17011b845cf..4d67f6f1511 100644
--- a/library/core/tests/lib.rs
+++ b/library/core/tests/lib.rs
@@ -56,6 +56,7 @@
 #![feature(min_specialization)]
 #![feature(numfmt)]
 #![feature(num_midpoint)]
+#![feature(isqrt)]
 #![feature(step_trait)]
 #![feature(str_internals)]
 #![feature(std_internals)]