diff --git a/src/uri/mod.rs b/src/uri/mod.rs
index 5233aece..cce376a5 100644
--- a/src/uri/mod.rs
+++ b/src/uri/mod.rs
@@ -137,6 +137,7 @@ enum ErrorKind {
     SchemeMissing,
     AuthorityMissing,
     PathAndQueryMissing,
+    SlashInPathMissing,
     TooLong,
     Empty,
     SchemeTooLong,
@@ -192,6 +193,14 @@ impl Uri {
             }
         }
 
+        if let (&Some(_), &Some(ref path_and_query)) = (&src.authority, &src.path_and_query) {
+            let path = path_and_query.path();
+            if !path.is_empty() && !path.starts_with('/') {
+                // As per RFC3986 sections 3 and 3.3
+                return Err(ErrorKind::SlashInPathMissing.into());
+            }
+        }
+
         let scheme = match src.scheme {
             Some(scheme) => scheme,
             None => Scheme { inner: Scheme2::None },
@@ -991,6 +1000,7 @@ impl Error for InvalidUri {
             ErrorKind::SchemeMissing => "scheme missing",
             ErrorKind::AuthorityMissing => "authority missing",
             ErrorKind::PathAndQueryMissing => "path missing",
+            ErrorKind::SlashInPathMissing => "slash in path missing",
             ErrorKind::TooLong => "uri too long",
             ErrorKind::Empty => "empty string",
             ErrorKind::SchemeTooLong => "scheme too long",
diff --git a/src/uri/tests.rs b/src/uri/tests.rs
index 08b32ead..3ee2347d 100644
--- a/src/uri/tests.rs
+++ b/src/uri/tests.rs
@@ -1,6 +1,6 @@
 use std::str::FromStr;
 
-use super::{ErrorKind, InvalidUri, Uri, URI_CHARS};
+use super::*;
 
 #[test]
 fn test_char_table() {
@@ -445,3 +445,30 @@ fn test_authority_uri_parts_round_trip() {
     assert_eq!(uri2, s);
     assert_eq!(uri2.to_string(), s);
 }
+
+#[test]
+/// As per RFC3986 sections 3 and 3.3
+fn test_authority_slash_path() {
+    fn parse_from_parts(a: &str, p: &str) -> Result<Uri, InvalidUriParts> {
+        let mut parts = Parts::default();
+        parts.scheme = Some(Scheme::HTTP);
+        parts.authority = Some(Authority::from_str(a).expect("first parse"));
+        parts.path_and_query = Some(PathAndQuery::from_str(p).expect("second parse"));
+        Uri::from_parts(parts)
+    }
+
+    match parse_from_parts("hyper.rs", "foo") {
+        Err(InvalidUriParts(InvalidUri(ErrorKind::SlashInPathMissing))) => (),
+        bad => panic!("Unexpected result of first from_parts call: {:#?}", bad),
+    }
+
+    match parse_from_parts("hyper.rs", "/foo") {
+        Ok(_) => (),
+        bad => panic!("Unexpected result of second from_parts call: {:#?}", bad),
+    }
+
+    match parse_from_parts("hyper.rs", "") {
+        Ok(_) => (),
+        bad => panic!("Unexpected result of third from_parts call: {:#?}", bad),
+    }
+}