diff --git a/ci/build.sh b/ci/build.sh
index fb1a7572..2aabe905 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 
-if [ -z NO_STD ]; then
+if [ -z "$NO_STD" ]; then
     cargo build --verbose;
     cargo build --verbose --features "arbitrary";
     cargo build --verbose --features "mint";
@@ -10,6 +10,7 @@ if [ -z NO_STD ]; then
     cargo build --verbose --features "debug";
     cargo build --verbose --features "debug arbitrary mint serde-serialize abomonation-serialize";
 else
+    rustup component add rust-src
     cargo install xargo;
     xargo build --verbose --no-default-features --target=x86_64-unknown-linux-gnu --features "${CARGO_FEATURES}";
 fi
\ No newline at end of file
diff --git a/ci/test.sh b/ci/test.sh
index 6b0912c2..a144136f 100755
--- a/ci/test.sh
+++ b/ci/test.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 
-if [ -z NO_STD ]; then
+if [ -z "$NO_STD" ]; then
     cargo test --verbose;
     cargo test --verbose "debug arbitrary mint serde-serialize abomonation-serialize";
     cd nalgebra-lapack; cargo test --verbose;