diff --git a/doc/gitian-building.md b/doc/gitian-building.md
index 54993d13a..69d79b3c6 100644
--- a/doc/gitian-building.md
+++ b/doc/gitian-building.md
@@ -313,7 +313,7 @@ Setting up the Gitian image
 -------------------------
 
 Gitian needs a virtual image of the operating system to build in.
-Currently this is Ubuntu Precise x86_64.
+Currently this is Ubuntu Trusty x86_64.
 This image will be copied and used every time that a build is started to
 make sure that the build is deterministic.
 Creating the image will take a while, but only has to be done once.