diff --git a/src/uu/expr/src/syntax_tree.rs b/src/uu/expr/src/syntax_tree.rs
index e0e786b3a..c55fb0bdc 100644
--- a/src/uu/expr/src/syntax_tree.rs
+++ b/src/uu/expr/src/syntax_tree.rs
@@ -464,12 +464,15 @@ fn infix_operator_or(values: &[String]) -> String {
     assert!(values.len() == 2);
     if value_as_bool(&values[0]) {
         values[0].clone()
-    } else {
+    } else if value_as_bool(&values[1]) {
         values[1].clone()
+    } else {
+        0.to_string()
     }
 }
 
 fn infix_operator_and(values: &[String]) -> String {
+    assert!(values.len() == 2);
     if value_as_bool(&values[0]) && value_as_bool(&values[1]) {
         values[0].clone()
     } else {
diff --git a/tests/by-util/test_expr.rs b/tests/by-util/test_expr.rs
index d4cca43a2..28cfcf0ec 100644
--- a/tests/by-util/test_expr.rs
+++ b/tests/by-util/test_expr.rs
@@ -143,6 +143,14 @@ fn test_or() {
         .args(&["12", "|", "9a", "+", "1"])
         .succeeds()
         .stdout_only("12\n");
+
+    new_ucmd!().args(&["", "|", ""]).run().stdout_only("0\n");
+
+    new_ucmd!().args(&["", "|", "0"]).run().stdout_only("0\n");
+
+    new_ucmd!().args(&["", "|", "00"]).run().stdout_only("0\n");
+
+    new_ucmd!().args(&["", "|", "-0"]).run().stdout_only("0\n");
 }
 
 #[test]
@@ -152,14 +160,20 @@ fn test_and() {
         .succeeds()
         .stdout_only("foo\n");
 
-    new_ucmd!().args(&["", "&", "1"]).run().stdout_is("0\n");
-
-    new_ucmd!().args(&["14", "&", "1"]).run().stdout_is("14\n");
+    new_ucmd!()
+        .args(&["14", "&", "1"])
+        .succeeds()
+        .stdout_only("14\n");
 
     new_ucmd!()
         .args(&["-14", "&", "1"])
-        .run()
-        .stdout_is("-14\n");
+        .succeeds()
+        .stdout_only("-14\n");
+
+    new_ucmd!()
+        .args(&["-1", "&", "10", "/", "5"])
+        .succeeds()
+        .stdout_only("-1\n");
 
     new_ucmd!()
         .args(&["0", "&", "a", "/", "5"])
@@ -171,10 +185,9 @@ fn test_and() {
         .run()
         .stdout_only("0\n");
 
-    new_ucmd!()
-        .args(&["-1", "&", "10", "/", "5"])
-        .succeeds()
-        .stdout_only("-1\n");
+    new_ucmd!().args(&["", "&", "1"]).run().stdout_only("0\n");
+
+    new_ucmd!().args(&["", "&", ""]).run().stdout_only("0\n");
 }
 
 #[test]