diff --git a/pipepar/pipeline_template.c b/pipepar/pipeline_template.c
index bcc997c..33d183d 100644
--- a/pipepar/pipeline_template.c
+++ b/pipepar/pipeline_template.c
@@ -184,9 +184,55 @@ int compute_metrics(void)
 #endif
 #endif
 
+#if NB_CORES > 1
+#if NB_CORES == 2
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, i)
+#elif NB_CORES == 3
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, i)
+#elif NB_CORES == 4
 #pragma omp parallel default (none) \
 	shared (nb_packets, seed) \
 	private (state1, state2, state3, i)
+#elif NB_CORES == 5
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, i)
+#elif NB_CORES == 6
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, state5, i)
+#elif NB_CORES == 7
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, state5, state6, i)
+#elif NB_CORES == 8
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, state5, state6, state7, i)
+#elif NB_CORES == 9
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, state5, state6, state7, state8, i)
+#elif NB_CORES == 10
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, state5, state6, state7, state8, state9, i)
+#elif NB_CORES == 11
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, state5, state6, state7, state8, state9, state10, i)
+#elif NB_CORES == 12
+#pragma omp parallel default (none) \
+	shared (nb_packets, seed) \
+	private (state1, state2, state3, state4, state5, state6, state7, state8, state9, state11, i)
+#else
+#error Only supporting NB_CORES <= 12
+#endif
+#endif
 	{
 #pragma omp single
 		{