diff --git a/src/cargo/core/source/source_id.rs b/src/cargo/core/source/source_id.rs
index a1a7e3695d8..2f95e10e839 100644
--- a/src/cargo/core/source/source_id.rs
+++ b/src/cargo/core/source/source_id.rs
@@ -617,7 +617,12 @@ impl Ord for SourceKind {
 // you're able to restore the hash to its original value, please do so!
 // Otherwise please just leave a comment in your PR as to why the hash value is
 // changing and why the old value can't be easily preserved.
+//
+// The hash value depends on endianness and bit-width, so we only run this test on
+// little-endian 64-bit CPUs (such as x86-64 and ARM64) where it matches the
+// well-known value.
 #[test]
+#[cfg(all(target_endian = "little", target_pointer_width = "64"))]
 fn test_cratesio_hash() {
     let config = Config::default().unwrap();
     let crates_io = SourceId::crates_io(&config).unwrap();