diff --git a/debian/tests/test-xtensor b/debian/tests/test-xtensor
index 9d8b5b60044805ef308e7e0b435baa5860a1f64a..685b3bc2db60e11ffcabdec639f0d51006626cf4 100755
--- a/debian/tests/test-xtensor
+++ b/debian/tests/test-xtensor
@@ -17,4 +17,4 @@ cd "$AUTOPKGTEST_TMP"
 echo "Testing with ${CC} and ${CXX}:"
 mkdir build && cd build
 CC=${CC} CXX=${CXX} cmake .. ${BUILD_OPTIONS}
-CTEST_OUTPUT_ON_FAILURE=1 make -j $(nproc) VERBOSE=1 xtest
+CTEST_OUTPUT_ON_FAILURE=1 make -j 1 VERBOSE=1 xtest