diff --git a/crates/cfg/src/dnf.rs b/crates/cfg/src/dnf.rs
index 35f946e6fd..a08c307dac 100644
--- a/crates/cfg/src/dnf.rs
+++ b/crates/cfg/src/dnf.rs
@@ -458,6 +458,7 @@ mod test {
             &opts,
             expect![["test and test2 are enabled"]],
         );
+        check_why_inactive("#![cfg(all(a, b))]", &opts, expect![["a and b are disabled"]]);
         check_why_inactive(
             "#![cfg(all(not(test), a))]",
             &opts,
diff --git a/crates/cfg/src/lib.rs b/crates/cfg/src/lib.rs
index 0b0734213f..28a40a0827 100644
--- a/crates/cfg/src/lib.rs
+++ b/crates/cfg/src/lib.rs
@@ -137,7 +137,7 @@ impl fmt::Display for InactiveReason {
             for (i, atom) in self.disabled.iter().enumerate() {
                 let sep = match i {
                     0 => "",
-                    _ if i == self.enabled.len() - 1 => " and ",
+                    _ if i == self.disabled.len() - 1 => " and ",
                     _ => ", ",
                 };
                 f.write_str(sep)?;