diff --git a/.ci/build.sh b/.ci/build.sh
index 20c75afa..fb0e7e04 100755
--- a/.ci/build.sh
+++ b/.ci/build.sh
@@ -5,9 +5,7 @@ set -ex
 cargo build --verbose
 cargo test --verbose
 
-if [ "$TRAVIS_RUST_VERSION" = "nightly" ]
-then
+if [[ $TRAVIS_RUST_VERSION == "nightly" ]]; then
     cargo build --verbose --features no_std
     cargo test --verbose --features no_std
 fi
-