diff --git a/rfb/PixelFormat.cxx b/rfb/PixelFormat.cxx
index 683b53a..d20be93 100644
--- a/rfb/PixelFormat.cxx
+++ b/rfb/PixelFormat.cxx
@@ -154,7 +154,7 @@
   }
 
   if (!trueColour) {
-    strncat(str, " colour-map", len-1-strlen(str));
+    strncat(str, " color-map", len-1-strlen(str));
     return;
   }