diff --git a/src/context.cc b/src/context.cc
index 64bf8a4c..93bf8a7f 100644
--- a/src/context.cc
+++ b/src/context.cc
@@ -231,7 +231,7 @@ StringView Context::main_sel_register_value(StringView reg) const
 {
     auto strings = RegisterManager::instance()[reg].values(*this);
     size_t index = m_selections ? (*m_selections).main_index() : 0;
-    if (strings.size() < index)
+    if (strings.size() <= index)
         index = strings.size() - 1;
    return strings[index];
 }