diff --git a/src/command_manager.hh b/src/command_manager.hh
index 454ff95e..415b3530 100644
--- a/src/command_manager.hh
+++ b/src/command_manager.hh
@@ -16,10 +16,6 @@ namespace Kakoune
 
 struct Context;
 
-struct wrong_argument_count : runtime_error
-{
-    wrong_argument_count() : runtime_error("wrong argument count") {}
-};
 
 using CommandParameters = memoryview<String>;
 
diff --git a/src/commands.cc b/src/commands.cc
index 5c1146fb..d862a61a 100644
--- a/src/commands.cc
+++ b/src/commands.cc
@@ -33,6 +33,11 @@ extern bool    quit_requested;
 namespace
 {
 
+struct wrong_argument_count : runtime_error
+{
+    wrong_argument_count() : runtime_error("wrong argument count") {}
+};
+
 struct unknown_option : public runtime_error
 {
     unknown_option(const String& name)