diff --git a/ci/build-linux-autotools.sh b/ci/build-linux-autotools.sh
index 385e8c21..cc404e9b 100755
--- a/ci/build-linux-autotools.sh
+++ b/ci/build-linux-autotools.sh
@@ -41,4 +41,4 @@ mkdir build || true
 cd build
 ../configure
 
-make -j {NPROCESSORS:-2}
+make -j ${NPROCESSORS:-2}