diff --git a/src/uri/path.rs b/src/uri/path.rs
index dfbb2e95..c64362dd 100644
--- a/src/uri/path.rs
+++ b/src/uri/path.rs
@@ -447,7 +447,7 @@ const fn scan_path_and_query(bytes: &[u8]) -> Result<Scanned, ErrorKind> {
             0x7E => {}
 
             // potentially utf8, might not, should check
-            0x7F..=0xFF => {
+            0x80..=0xFF => {
                 is_maybe_not_utf8 = true;
             }
 
@@ -484,7 +484,7 @@ const fn scan_path_and_query(bytes: &[u8]) -> Result<Scanned, ErrorKind> {
                 0x3D |
                 0x3F..=0x7E => {}
 
-                0x7F..=0xFF => {
+                0x80..=0xFF => {
                     is_maybe_not_utf8 = true;
                 }
 
@@ -639,6 +639,16 @@ mod tests {
         PathAndQuery::try_from("sneaky").expect_err("reject missing slash");
     }
 
+    #[test]
+    fn rejects_del_in_path() {
+        PathAndQuery::try_from(&[b'/', 0x7F][..]).expect_err("reject DEL");
+    }
+
+    #[test]
+    fn rejects_del_in_query() {
+        PathAndQuery::try_from(&[b'/', b'a', b'?', 0x7F][..]).expect_err("reject DEL");
+    }
+
     #[test]
     fn json_is_fine() {
         assert_eq!(