diff --git a/src/de.rs b/src/de.rs
index 8cb7ae0..d02103c 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -11,6 +11,8 @@
 use std::io;
 use std::marker::PhantomData;
 use std::{i32, u64};
+use std::result;
+use std::str::FromStr;
 
 use serde::de::{self, Expected, Unexpected};
 
@@ -481,9 +483,7 @@ impl<'de, R: Read<'de>> Deserializer<R> {
         Ok(if positive { 0.0 } else { -0.0 })
     }
 
-    // Not public API. Should be pub(crate).
-    #[doc(hidden)]
-    pub fn parse_any_signed_number(&mut self) -> Result<Number> {
+    fn parse_any_signed_number(&mut self) -> Result<Number> {
         let peek = match try!(self.peek()) {
             Some(b) => b,
             None => {
@@ -910,6 +910,16 @@ impl<'de, R: Read<'de>> Deserializer<R> {
     }
 }
 
+impl FromStr for super::Number {
+    type Err = Error;
+
+    fn from_str(s: &str) -> result::Result<Self, Self::Err> {
+        Deserializer::from_str(s)
+            .parse_any_signed_number()
+            .map(|n| n.into())
+    }
+}
+
 #[cfg_attr(rustfmt, rustfmt_skip)]
 static POW10: [f64; 309] =
     [1e000, 1e001, 1e002, 1e003, 1e004, 1e005, 1e006, 1e007, 1e008, 1e009,
diff --git a/src/number.rs b/src/number.rs
index 833dcfe..69f2911 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -11,7 +11,6 @@ use serde::de::{self, Unexpected, Visitor};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use std::fmt::{self, Debug, Display};
 use std::i64;
-use std::str::FromStr;
 
 #[cfg(feature = "arbitrary_precision")]
 use dtoa;
@@ -644,16 +643,6 @@ impl<'de> Deserializer<'de> for NumberFieldDeserializer {
     }
 }
 
-impl FromStr for Number {
-    type Err = Error;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        super::de::Deserializer::from_str(s)
-            .parse_any_signed_number()
-            .map(|n| n.into())
-    }
-}
-
 impl From<super::de::Number> for Number {
     fn from(value: super::de::Number) -> Self {
         let n = match value {