diff --git a/soc/xtensa/intel_adsp/ace/multiprocessing.c b/soc/xtensa/intel_adsp/ace/multiprocessing.c
index 599acb7e12a..2b59307c110 100644
--- a/soc/xtensa/intel_adsp/ace/multiprocessing.c
+++ b/soc/xtensa/intel_adsp/ace/multiprocessing.c
@@ -113,7 +113,7 @@ int soc_adsp_halt_cpu(int id)
 		return -EINVAL;
 	}
 
-	CHECKIF(soc_cpus_active[id]) {
+	CHECKIF(!soc_cpus_active[id]) {
 		return -EINVAL;
 	}
 
@@ -131,5 +131,8 @@ int soc_adsp_halt_cpu(int id)
 		return -EINVAL;
 	}
 
+	/* Stop sending IPIs to this core */
+	soc_cpus_active[id] = false;
+
 	return 0;
 }