diff --git a/src/libcore/core.rs b/src/libcore/core.rs
index 2522a98609c..8b55a04ca48 100644
--- a/src/libcore/core.rs
+++ b/src/libcore/core.rs
@@ -11,6 +11,7 @@ import option::extensions;
 import option_iter::extensions;
 import ptr::extensions;
 import rand::extensions;
+import result::extensions;
 
 export path, option, some, none, unreachable;
 export extensions;