diff --git a/src/color.cc b/src/color.cc
index aa1980d9..54e48002 100644
--- a/src/color.cc
+++ b/src/color.cc
@@ -30,7 +30,7 @@ Color str_to_color(const String& color)
     return Colors::Default;
 }
 
-String color_to_str(const Color& color)
+String color_to_str(Color color)
 {
     switch (color.color)
     {
@@ -54,7 +54,7 @@ String color_to_str(const Color& color)
     return "default";
 }
 
-String option_to_string(const Color& color)
+String option_to_string(Color color)
 {
     return color_to_str(color);
 }
diff --git a/src/color.hh b/src/color.hh
index 9cc5abf5..16e6b678 100644
--- a/src/color.hh
+++ b/src/color.hh
@@ -34,21 +34,20 @@ struct Color
     Color(unsigned char r, unsigned char g, unsigned char b)
         : color{Colors::RGB}, r{r}, g{g}, b{b} {}
 
-    bool operator==(const Color& c) const
+    bool operator==(Color c) const
     { return color == c.color and r == c.r and g == c.g and b == c.b; }
-    bool operator!=(const Color& c) const
+    bool operator!=(Color c) const
     { return color != c.color or r != c.r or g != c.g or b != c.b; }
 };
 
 using ColorPair = std::pair<Color, Color>;
 
 Color str_to_color(const String& color);
-String color_to_str(const Color& color);
+String color_to_str(Color color);
 
-String option_to_string(const Color& color);
+String option_to_string(Color color);
 void option_from_string(const String& str, Color& color);
 
 }
 
 #endif // color_hh_INCLUDED
-
diff --git a/src/ncurses.cc b/src/ncurses.cc
index 25d137ba..0f084da0 100644
--- a/src/ncurses.cc
+++ b/src/ncurses.cc
@@ -29,7 +29,7 @@ static void set_attribute(int attribute, bool on)
         attroff(attribute);
 }
 
-static bool operator<(const Color& lhs, const Color& rhs)
+static bool operator<(Color lhs, Color rhs)
 {
     if (lhs.color == rhs.color and lhs.color == Colors::RGB)
         return lhs.r == rhs.r ? (lhs.g == rhs.g ? lhs.b < rhs.b
@@ -38,7 +38,7 @@ static bool operator<(const Color& lhs, const Color& rhs)
     return lhs.color < rhs.color;
 }
 
-static int nc_color(const Color& color)
+static int nc_color(Color color)
 {
     static std::map<Color, int> colors = {
         { Colors::Default, -1 },
@@ -99,7 +99,7 @@ static int nc_color(const Color& color)
     }
 }
 
-static int get_color_pair(const ColorPair& colors)
+static int get_color_pair(ColorPair colors)
 {
     static std::map<ColorPair, int> colorpairs;
     static int next_pair = 1;
@@ -115,7 +115,7 @@ static int get_color_pair(const ColorPair& colors)
     }
 }
 
-static void set_color(WINDOW* window, const ColorPair colors)
+static void set_color(WINDOW* window, ColorPair colors)
 {
     static int current_pair = -1;
 
diff --git a/src/remote.cc b/src/remote.cc
index f9a22988..5fe996d6 100644
--- a/src/remote.cc
+++ b/src/remote.cc
@@ -75,7 +75,7 @@ public:
         write(memoryview<T>(vec));
     }
 
-    void write(const Color& color)
+    void write(Color color)
     {
         write(color.color);
         if (color.color == Colors::RGB)
@@ -86,7 +86,7 @@ public:
         }
     }
 
-    void write(const ColorPair& colors)
+    void write(ColorPair colors)
     {
         write(colors.first);
         write(colors.second);