diff --git a/ctl/string.cc b/ctl/string.cc
index 503ade6a8..62301bcfd 100644
--- a/ctl/string.cc
+++ b/ctl/string.cc
@@ -289,7 +289,7 @@ string::substr(size_t pos, size_t count) const noexcept
 }
 
 string&
-string::replace(size_t pos, size_t count, const string_view& s) noexcept
+string::replace(size_t pos, size_t count, const string_view s) noexcept
 {
     size_t last;
     if (ckd_add(&last, pos, count))
diff --git a/ctl/string.h b/ctl/string.h
index 450bb44b2..e5a848cc4 100644
--- a/ctl/string.h
+++ b/ctl/string.h
@@ -8,8 +8,7 @@ namespace ctl {
 
 class string;
 
-string
-strcat(const string_view, const string_view) noexcept __wur;
+string strcat(string_view, string_view) noexcept __wur;
 
 namespace __ {
 
@@ -50,7 +49,7 @@ class string
     static constexpr size_t npos = -1;
 
     ~string() /* noexcept */;
-    string(const string_view) noexcept;
+    string(string_view) noexcept;
     string(const char*) noexcept;
     string(const string&) noexcept;
     string(const char*, size_t) noexcept;
@@ -67,17 +66,17 @@ class string
     void append(char, size_t) noexcept;
     void append(unsigned long) noexcept;
     void append(const void*, size_t) noexcept;
-    string& insert(size_t, const string_view) noexcept;
+    string& insert(size_t, string_view) noexcept;
     string& erase(size_t = 0, size_t = npos) noexcept;
     string substr(size_t = 0, size_t = npos) const noexcept;
-    string& replace(size_t, size_t, const string_view&) noexcept;
-    bool operator==(const string_view) const noexcept;
-    bool operator!=(const string_view) const noexcept;
-    bool contains(const string_view) const noexcept;
-    bool ends_with(const string_view) const noexcept;
-    bool starts_with(const string_view) const noexcept;
+    string& replace(size_t, size_t, string_view) noexcept;
+    bool operator==(string_view) const noexcept;
+    bool operator!=(string_view) const noexcept;
+    bool contains(string_view) const noexcept;
+    bool ends_with(string_view) const noexcept;
+    bool starts_with(string_view) const noexcept;
     size_t find(char, size_t = 0) const noexcept;
-    size_t find(const string_view, size_t = 0) const noexcept;
+    size_t find(string_view, size_t = 0) const noexcept;
 
     string() noexcept
     {
@@ -330,7 +329,7 @@ class string
         return reinterpret_cast<const __::big_string*>(blob);
     }
 
-    friend string strcat(const string_view, const string_view);
+    friend string strcat(string_view, string_view);
 
     alignas(union {
         __::big_string a;
diff --git a/ctl/string_view.h b/ctl/string_view.h
index 0fe526baf..87e409065 100644
--- a/ctl/string_view.h
+++ b/ctl/string_view.h
@@ -36,16 +36,16 @@ struct string_view
     {
     }
 
-    bool operator==(const string_view) const noexcept;
-    bool operator!=(const string_view) const noexcept;
-    bool contains(const string_view) const noexcept;
-    bool ends_with(const string_view) const noexcept;
-    bool starts_with(const string_view) const noexcept;
+    bool operator==(string_view) const noexcept;
+    bool operator!=(string_view) const noexcept;
+    bool contains(string_view) const noexcept;
+    bool ends_with(string_view) const noexcept;
+    bool starts_with(string_view) const noexcept;
     string_view substr(size_t = 0, size_t = npos) const noexcept;
     size_t find(char, size_t = 0) const noexcept;
-    size_t find(const string_view, size_t = 0) const noexcept;
+    size_t find(string_view, size_t = 0) const noexcept;
 
-    constexpr string_view& operator=(const string_view& s) noexcept
+    constexpr string_view& operator=(const string_view s) noexcept
     {
         p = s.p;
         n = s.n;