diff --git a/ch12.asciidoc b/ch12.asciidoc
index 23b20f10..d10f4eaf 100644
--- a/ch12.asciidoc
+++ b/ch12.asciidoc
@@ -74,7 +74,7 @@ The term derives from the idea of "coloring" or marking a nominal amount of bitc
 
 After _EPOBC_, more recent implementations of colored coins use the OP_RETURN script opcode to store metadata in a transaction, in conjunction with external data stores which associate the metadata to specific assets.
 
-The two most prominent implementations of colored coins today are http://www.openassets.org/[_Open Assets_] and https://coloredcoins.org[_Colored Coins by Colu_]. These two systems use different approaches to colored coins and are not compatible. Colored coins created in one system cannot be seen or used in the other system.
+The two most prominent implementations of colored coins today are http://www.openassets.org/[_Open Assets_] and http://coloredcoins.org[_Colored Coins by Colu_]. These two systems use different approaches to colored coins and are not compatible. Colored coins created in one system cannot be seen or used in the other system.
 
 ==== Using Colored Coins