diff --git a/src/cfgparse.c b/src/cfgparse.c
index a8d5f87fb..bfcaba883 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -2801,7 +2801,7 @@ int check_config_validity()
 		{
 			int numa_cores = 0;
 #if defined(USE_CPU_AFFINITY)
-			if (global.numa_cpu_mapping && !thread_cpu_mask_forced())
+			if (global.numa_cpu_mapping && !thread_cpu_mask_forced() && !cpu_map_configured())
 				numa_cores = numa_detect_topology();
 #endif
 			global.nbthread = numa_cores ? numa_cores :