diff --git a/os/oscolor.c b/os/oscolor.c
index cc45aafb1..69eadc23e 100644
--- a/os/oscolor.c
+++ b/os/oscolor.c
@@ -1590,6 +1590,8 @@ OsLookupColor(int		screen,
 	mid = (low + high) / 2;
 	c = &BuiltinColors[mid];
 	r = strncasecmp (&BuiltinColorNames[c->name], name, len);
+	if (r == 0 && strlen (&BuiltinColorNames[c->name]) > len)
+	    r++;
 	if (r == 0)
 	{
 	    *pred = c->red * 0x101;