diff --git a/src/autoload.h b/src/autoload.h
index 64efce9c4..ef468f686 100644
--- a/src/autoload.h
+++ b/src/autoload.h
@@ -54,7 +54,7 @@ class autoload_t {
     /// Construct an autoloader that loads from the paths given by \p env_var_name.
     explicit autoload_t(wcstring env_var_name);
 
-    autoload_t(autoload_t &&);
+    autoload_t(autoload_t &&) noexcept;
     ~autoload_t();
 
     /// Given a command, get a path to autoload.
diff --git a/src/complete.cpp b/src/complete.cpp
index 584296d55..d54eb24d9 100644
--- a/src/complete.cpp
+++ b/src/complete.cpp
@@ -226,9 +226,9 @@ completion_t::completion_t(wcstring comp, wcstring desc, string_fuzzy_match_t ma
       flags(resolve_auto_space(completion, flags_val)) {}
 
 completion_t::completion_t(const completion_t &) = default;
-completion_t::completion_t(completion_t &&) = default;
+completion_t::completion_t(completion_t &&) noexcept = default;
 completion_t &completion_t::operator=(const completion_t &) = default;
-completion_t &completion_t::operator=(completion_t &&) = default;
+completion_t &completion_t::operator=(completion_t &&) noexcept = default;
 completion_t::~completion_t() = default;
 
 __attribute__((always_inline)) static inline bool natural_compare_completions(