diff --git a/OpenMP/linear-algebra/kernels/atax/Makefile b/OpenMP/linear-algebra/kernels/atax/Makefile
index 96c7b77..b499897 100644
--- a/OpenMP/linear-algebra/kernels/atax/Makefile
+++ b/OpenMP/linear-algebra/kernels/atax/Makefile
@@ -13,6 +13,8 @@ CFLAGS+= -Wextra
 CFLAGS+= -O3 
 # -g3 enables some useful debug things
 CFLAGS+= -g3
+# -DTHREAD_COUNT allows us to alter the number of threads used in the whole file
+CFLAGS+= -DTHREAD_COUNT=4
 
 # Disable make output
 MAKEFLAGS+= --silent
diff --git a/OpenMP/linear-algebra/kernels/atax/atax.c b/OpenMP/linear-algebra/kernels/atax/atax.c
index 84fde91..787db79 100644
--- a/OpenMP/linear-algebra/kernels/atax/atax.c
+++ b/OpenMP/linear-algebra/kernels/atax/atax.c
@@ -25,7 +25,7 @@ static void init_array(int nx, int ny,
   int i, j;
 
   /// Initialize the `x` array with PI and its multiples.
-  #pragma omp parallel for num_threads(4) schedule(static)
+  #pragma omp parallel for num_threads(THREAD_COUNT) schedule(static)
   for (i = 0; i < ny; i++) {
     x[i] = i * M_PI;
   }
@@ -64,7 +64,7 @@ static void kernel_atax(int nx, int ny,
 {
   int i, j;
 
-  #pragma omp parallel for num_threads(4) schedule(static)
+  #pragma omp parallel for num_threads(THREAD_COUNT) schedule(static)
   for (i = 0; i < _PB_NY; i++)
     y[i] = 0;