diff --git a/src/option_manager.cc b/src/option_manager.cc
index 34f30d92..2fba4546 100644
--- a/src/option_manager.cc
+++ b/src/option_manager.cc
@@ -39,6 +39,12 @@ void OptionManager::unregister_watcher(OptionManagerWatcher& watcher)
     m_watchers.erase(it);
 }
 
+struct option_not_found : public runtime_error
+{
+    option_not_found(StringView name)
+        : runtime_error("option not found: " + name) {}
+};
+
 Option& OptionManager::get_local_option(StringView name)
 {
     auto it = find_option(m_options, name);
diff --git a/src/option_manager.hh b/src/option_manager.hh
index ad295fb4..ec56cf10 100644
--- a/src/option_manager.hh
+++ b/src/option_manager.hh
@@ -12,12 +12,6 @@
 namespace Kakoune
 {
 
-struct option_not_found : public runtime_error
-{
-    option_not_found(StringView name)
-        : runtime_error("option not found: " + name) {}
-};
-
 class OptionManager;
 
 enum class OptionFlags