diff --git a/CMakeLists.txt b/CMakeLists.txt
index aeb3752f6..edc9b204a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -222,7 +222,7 @@ if(SIMENG_ENABLE_TESTS)
                 # We also include the headers and CMake exports for a *complete* build
                 install-llvm-headers
                 install-cmake-exports
-                -j ${N}
+                -j ${NPROC}
 
                 ${COMMAND_ECHO_OPTION}
                 RESULT_VARIABLE SUCCESS)