diff --git a/src/header/value.rs b/src/header/value.rs
index 3ebb8451..d14ba571 100644
--- a/src/header/value.rs
+++ b/src/header/value.rs
@@ -123,7 +123,15 @@ impl HeaderValue {
     /// ```
     #[inline]
     pub fn from_str(src: &str) -> Result<HeaderValue, InvalidHeaderValue> {
-        HeaderValue::try_from_generic(src, |s| Bytes::copy_from_slice(s.as_bytes()))
+        for &b in src.as_bytes() {
+            if !is_visible_ascii(b) {
+                return Err(InvalidHeaderValue { _priv: () });
+            }
+        }
+        Ok(HeaderValue {
+            inner: Bytes::copy_from_slice(src.as_bytes()),
+            is_sensitive: false,
+        })
     }
 
     /// Converts a HeaderName into a HeaderValue
@@ -203,7 +211,6 @@ impl HeaderValue {
                 }
             }
         } else {
-
             if_downcast_into!(T, Bytes, src, {
                 return HeaderValue {
                     inner: src,
@@ -223,7 +230,10 @@ impl HeaderValue {
         HeaderValue::try_from_generic(src, std::convert::identity)
     }
 
-    fn try_from_generic<T: AsRef<[u8]>, F: FnOnce(T) -> Bytes>(src: T, into: F) -> Result<HeaderValue, InvalidHeaderValue> {
+    fn try_from_generic<T: AsRef<[u8]>, F: FnOnce(T) -> Bytes>(
+        src: T,
+        into: F,
+    ) -> Result<HeaderValue, InvalidHeaderValue> {
         for &b in src.as_ref() {
             if !is_valid(b) {
                 return Err(InvalidHeaderValue { _priv: () });