diff --git a/src/cargo/util/command_prelude.rs b/src/cargo/util/command_prelude.rs
index 6bb219bcf23..3069a379971 100644
--- a/src/cargo/util/command_prelude.rs
+++ b/src/cargo/util/command_prelude.rs
@@ -1121,13 +1121,13 @@ fn get_targets_from_metadata() -> CargoResult<Vec<Target>> {
 fn get_target_triples() -> Vec<clap_complete::CompletionCandidate> {
     let mut candidates = Vec::new();
 
-    if is_rustup() {
-        if let Ok(targets) = get_target_triples_from_rustup() {
-            candidates.extend(targets);
-        }
-    } else {
+    if let Ok(targets) = get_target_triples_from_rustup() {
+        candidates = targets;
+    }
+
+    if candidates.is_empty() {
         if let Ok(targets) = get_target_triples_from_rustc() {
-            candidates.extend(targets);
+            candidates = targets;
         }
     }