diff --git a/src/uu/join/src/join.rs b/src/uu/join/src/join.rs
index a338a22c4e6..da0da784b7b 100644
--- a/src/uu/join/src/join.rs
+++ b/src/uu/join/src/join.rs
@@ -524,6 +524,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         settings.separator = match value.len() {
             0 => Sep::Line,
             1 => Sep::Char(value[0]),
+            2 if value[0] == b'\\' && value[1] == b'0' => Sep::Char(0),
             _ => {
                 return Err(USimpleError::new(
                     1,
diff --git a/tests/by-util/test_join.rs b/tests/by-util/test_join.rs
index 4b2d1bbbaee..2cd07787dfb 100644
--- a/tests/by-util/test_join.rs
+++ b/tests/by-util/test_join.rs
@@ -347,6 +347,17 @@ fn non_unicode() {
         .stdout_only_fixture("non-unicode.expected");
 }
 
+#[test]
+fn null_field_separators() {
+    new_ucmd!()
+        .arg("-t")
+        .arg("\\0")
+        .arg("non-unicode_1.bin")
+        .arg("non-unicode_2.bin")
+        .succeeds()
+        .stdout_only_fixture("null-sep.expected");
+}
+
 #[test]
 fn null_line_endings() {
     new_ucmd!()
diff --git a/tests/fixtures/join/null-sep.expected b/tests/fixtures/join/null-sep.expected
new file mode 100644
index 00000000000..7d91c578215
Binary files /dev/null and b/tests/fixtures/join/null-sep.expected differ