diff --git a/library/core/src/fmt/builders.rs b/library/core/src/fmt/builders.rs
index 197cddd3fa9de..1a7db8719b404 100644
--- a/library/core/src/fmt/builders.rs
+++ b/library/core/src/fmt/builders.rs
@@ -1228,7 +1228,7 @@ impl<'a, 'b: 'a> DebugMap<'a, 'b> {
 /// ```
 #[stable(feature = "fmt_from_fn", since = "1.93.0")]
 #[must_use = "returns a type implementing Debug and Display, which do not have any effects unless they are used"]
-pub fn from_fn<F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result>(f: F) -> FromFn<F> {
+pub const fn from_fn<F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result>(f: F) -> FromFn<F> {
     FromFn(f)
 }