--- a/Cargo.toml
+++ b/Cargo.toml
@@ -219,6 +219,9 @@
 [dependencies.zvariant_utils]
 version = "3.2.0"
 
+[target.'cfg(not(target_has_atomic = "64"))'.dependencies]
+portable-atomic = "1"
+
 [dev-dependencies.chrono]
 version = "0.4.38"
 features = [