diff --git a/formatters/tty_truecolour.go b/formatters/tty_truecolour.go
index d332f07..e9c264a 100644
--- a/formatters/tty_truecolour.go
+++ b/formatters/tty_truecolour.go
@@ -22,10 +22,10 @@ func trueColourFormatter(w io.Writer, style *chroma.Style, it chroma.Iterator) e
 				out += "\033[4m"
 			}
 			if entry.Colour.IsSet() {
-				out += fmt.Sprintf("\033[38:2:%d:%d:%dm", entry.Colour.Red(), entry.Colour.Green(), entry.Colour.Blue())
+				out += fmt.Sprintf("\033[38;2;%d;%d;%dm", entry.Colour.Red(), entry.Colour.Green(), entry.Colour.Blue())
 			}
 			if entry.Background.IsSet() {
-				out += fmt.Sprintf("\033[48:2:%d:%d:%dm", entry.Background.Red(), entry.Background.Green(), entry.Background.Blue())
+				out += fmt.Sprintf("\033[48;2;%d;%d;%dm", entry.Background.Red(), entry.Background.Green(), entry.Background.Blue())
 			}
 			fmt.Fprint(w, out)
 		}