diff --git a/bootstraptest/runner.rb b/bootstraptest/runner.rb
index d58b824386..fa5e8537e8 100755
--- a/bootstraptest/runner.rb
+++ b/bootstraptest/runner.rb
@@ -137,8 +137,8 @@ End
   if @color
     # dircolors-like style
     colors = (colors = ENV['TEST_COLORS']) ? Hash[colors.scan(/(\w+)=([^:]*)/)] : {}
-    @passed = "\e[#{colors["pass"] || "32"}m"
-    @failed = "\e[#{colors["fail"] || "31"}m"
+    @passed = "\e[;#{colors["pass"] || "32"}m"
+    @failed = "\e[;#{colors["fail"] || "31"}m"
     @reset = "\e[m"
   else
     @passed = @failed = @reset = ""
diff --git a/sample/test.rb b/sample/test.rb
index d7f80b1e39..85a11e0d4d 100755
--- a/sample/test.rb
+++ b/sample/test.rb
@@ -34,8 +34,8 @@ class Progress
     if @color
       # dircolors-like style
       colors = (colors = ENV['TEST_COLORS']) ? Hash[colors.scan(/(\w+)=([^:]*)/)] : {}
-      @passed = "\e[#{colors["pass"] || "32"}m"
-      @failed = "\e[#{colors["fail"] || "31"}m"
+      @passed = "\e[;#{colors["pass"] || "32"}m"
+      @failed = "\e[;#{colors["fail"] || "31"}m"
       @reset = "\e[m"
     else
       @passed = @failed = @reset = ""
diff --git a/test/lib/test/unit.rb b/test/lib/test/unit.rb
index c088d98068..996134eaf3 100644
--- a/test/lib/test/unit.rb
+++ b/test/lib/test/unit.rb
@@ -597,9 +597,9 @@ module Test
         if color
           # dircolors-like style
           colors = (colors = ENV['TEST_COLORS']) ? Hash[colors.scan(/(\w+)=([^:]*)/)] : {}
-          @passed_color = "\e[#{colors["pass"] || "32"}m"
-          @failed_color = "\e[#{colors["fail"] || "31"}m"
-          @skipped_color = "\e[#{colors["skip"] || "33"}m"
+          @passed_color = "\e[;#{colors["pass"] || "32"}m"
+          @failed_color = "\e[;#{colors["fail"] || "31"}m"
+          @skipped_color = "\e[;#{colors["skip"] || "33"}m"
           @reset_color = "\e[m"
         else
           @passed_color = @failed_color = @skipped_color = @reset_color = ""