diff --git a/ctl/shared_ptr.cc b/ctl/shared_ptr.cc
index ae8e4e75d..3da50a074 100644
--- a/ctl/shared_ptr.cc
+++ b/ctl/shared_ptr.cc
@@ -53,28 +53,28 @@ namespace ctl {
 namespace __ {
 
 void
-shared_control::add_shared() noexcept
+shared_control::keep_shared() noexcept
 {
     incref(&shared);
 }
 
 void
-shared_control::release_shared() noexcept
+shared_control::drop_shared() noexcept
 {
     if (decref(&shared)) {
         on_zero_shared();
-        release_weak();
+        drop_weak();
     }
 }
 
 void
-shared_control::add_weak() noexcept
+shared_control::keep_weak() noexcept
 {
     incref(&weak);
 }
 
 void
-shared_control::release_weak() noexcept
+shared_control::drop_weak() noexcept
 {
     if (decref(&weak))
         on_zero_weak();
diff --git a/ctl/shared_ptr.h b/ctl/shared_ptr.h
index bd96dde50..c23e8281e 100644
--- a/ctl/shared_ptr.h
+++ b/ctl/shared_ptr.h
@@ -32,10 +32,10 @@ struct shared_control
     {
     }
 
-    void add_shared() noexcept;
-    void release_shared() noexcept;
-    void add_weak() noexcept;
-    void release_weak() noexcept;
+    void keep_shared() noexcept;
+    void drop_shared() noexcept;
+    void keep_weak() noexcept;
+    void drop_weak() noexcept;
     size_t use_count() const noexcept;
     size_t weak_count() const noexcept;
 
@@ -101,7 +101,7 @@ class shared_ptr
     shared_ptr(const shared_ptr& r) noexcept : p(r.p), ctl(r.ctl)
     {
         if (ctl)
-            ctl->add_shared();
+            ctl->keep_shared();
     }
 
     shared_ptr(shared_ptr&& r) noexcept : p(r.p), ctl(r.ctl)
@@ -114,7 +114,7 @@ class shared_ptr
     shared_ptr(const shared_ptr<U>& r, T* const p) noexcept : p(p), ctl(r.ctl)
     {
         if (ctl)
-            ctl->add_shared();
+            ctl->keep_shared();
     }
 
     template <typename U>
@@ -129,7 +129,7 @@ class shared_ptr
     ~shared_ptr()
     {
         if (ctl)
-            ctl->release_shared();
+            ctl->drop_shared();
     }
 
     shared_ptr& operator=(shared_ptr r) noexcept
@@ -141,7 +141,7 @@ class shared_ptr
     void reset() noexcept
     {
         if (ctl)
-            ctl->release_shared();
+            ctl->drop_shared();
         p = nullptr;
         ctl = nullptr;
     }