diff --git a/.travis.yml b/.travis.yml
index 7280687..52ad857 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,7 @@ script:
 - export CC=/usr/bin/gcc-6
 - export CXX=/usr/bin/g++-6
 # Make sure fuzz targets are not broken.
-- cargo check --tests --manifest-path=fuzz/Cargo.toml
+- cargo +nightly check --tests --manifest-path=fuzz/Cargo.toml
 - ./test.sh
 - ./doc.sh
 after_success: |