diff --git a/crates/engine/src/cmd/table_formula.rs b/crates/engine/src/cmd/table_formula.rs
index 165716d68..a68df8198 100644
--- a/crates/engine/src/cmd/table_formula.rs
+++ b/crates/engine/src/cmd/table_formula.rs
@@ -718,7 +718,10 @@ fn call(name: &str, args: &[Expr], here: &Here) -> Result<f64, CmdError> {
         }
         "ABS" => Ok(one(name, args, here)?.abs()),
         "INT" => Ok(one(name, args, here)?.floor()),
-        "SIGN" => Ok(one(name, args, here)?.signum()),
+        "SIGN" => {
+            let x = one(name, args, here)?;
+            Ok(if x == 0.0 { 0.0 } else { x.signum() })
+        }
         "ROUND" => match args {
             [a, b] => {
                 let x = scalar(eval(a, here)?)?;
@@ -763,6 +766,16 @@ mod tests {
         evaluate(t, r, c, f)
     }
 
+    #[test]
+    fn sign_of_zero_is_zero() {
+        let t = table(&[&["0", "5", "-5"]]);
+        assert_eq!(ev(&t, 0, 0, "=SIGN(0)"), Ok(0.0));
+        assert_eq!(ev(&t, 0, 0, "=SIGN(-0)"), Ok(0.0));
+        assert_eq!(ev(&t, 0, 1, "=SIGN(A1)"), Ok(0.0), "a cell holding 0");
+        assert_eq!(ev(&t, 0, 0, "=SIGN(5)"), Ok(1.0));
+        assert_eq!(ev(&t, 0, 0, "=SIGN(-5)"), Ok(-1.0));
+    }
+
     #[test]
     fn cell_references_count_from_one_and_from_a() {
         assert_eq!(cell_ref("A1"), Some((0, 0)));