diff --git a/src/lib.rs b/src/lib.rs
index f14408cc..07661311 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,6 +30,7 @@ pub mod vwmap;
 
 extern crate blas;
 extern crate intel_mkl_src;
+extern crate half;
 
 use crate::feature_buffer::FeatureBufferTranslator;
 use crate::multithread_helpers::BoxedRegressorTrait;