diff --git a/source/colorize/colors.d b/source/colorize/colors.d
index 6a3c869..774b1e2 100644
--- a/source/colorize/colors.d
+++ b/source/colorize/colors.d
@@ -77,27 +77,27 @@ string color(
 
 unittest
 {
-  import std.stdio;
+  import colorize.cwrite;
   string ret;
 
   ret = "This is yellow".color(fg.yellow);
-  writeln(ret);
+  cwriteln(ret);
   assert(ret == "\033[33mThis is yellow\033[0m");
 
   ret = "This is light green".color(fg.light_green);
-  writeln(ret);
+  cwriteln(ret);
   assert(ret == "\033[92mThis is light green\033[0m");
 
   ret = "This is light blue with red background".color(fg.light_blue, bg.red);
-  writeln(ret);
+  cwriteln(ret);
   assert(ret == "\033[0;94;41mThis is light blue with red background\033[0m");
 
   ret = "This is red on blue blinking".color(fg.red, bg.blue, mode.blink);
-  writeln(ret);
+  cwriteln(ret);
   assert(ret == "\033[5;31;44mThis is red on blue blinking\033[0m");
 
   ret = color("This is magenta", "magenta");
-  writeln(ret);
+  cwriteln(ret);
   assert(ret == "\033[35mThis is magenta\033[0m");
 }
 
@@ -180,7 +180,7 @@ alias colorHelper color;
 
 unittest
 {
-  import std.stdio;
+  import colorize.cwrite;
   string ret;
 
   ret = "This is red on blue blinking"
@@ -188,6 +188,6 @@ unittest
     .background(bg.blue)
     .style(mode.blink);
 
-  writeln(ret);
+  cwriteln(ret);
   assert(ret == "\033[5m\033[44m\033[31mThis is red on blue blinking\033[0m\033[0m\033[0m");
 }