diff --git a/sys/dev/quicc/quicc_bus.h b/sys/dev/quicc/quicc_bus.h
index 385c24b93f0..4c8bcd4210d 100644
--- a/sys/dev/quicc/quicc_bus.h
+++ b/sys/dev/quicc/quicc_bus.h
@@ -30,7 +30,7 @@
 #define	_DEV_QUICC_BUS_H_
 
 enum {
-	QUICC_IVAR_CLOCK = BUS_IVARS_PRIVATE + 1,	/* The CPM clock. */
+	QUICC_IVAR_CLOCK = BUS_IVARS_PRIVATE,	/* The CPM clock. */
 	QUICC_IVAR_BRGCLK,		/* The BRG clock affected by SCCR. */
 	QUICC_IVAR_DEVTYPE
 };
diff --git a/sys/dev/virtio/virtio.h b/sys/dev/virtio/virtio.h
index 6266dc29b94..1b8dc630e33 100644
--- a/sys/dev/virtio/virtio.h
+++ b/sys/dev/virtio/virtio.h
@@ -54,7 +54,7 @@ struct vq_alloc_info;
  * VirtIO instance variables indices.
  */
 enum {
-	VIRTIO_IVAR_DEVTYPE = BUS_IVARS_PRIVATE + 1,
+	VIRTIO_IVAR_DEVTYPE = BUS_IVARS_PRIVATE,
 	VIRTIO_IVAR_FEATURE_DESC,
 	VIRTIO_IVAR_VENDOR,
 	VIRTIO_IVAR_DEVICE,
diff --git a/sys/sys/cpu.h b/sys/sys/cpu.h
index 24c7ec6aacf..21e79e6db6a 100644
--- a/sys/sys/cpu.h
+++ b/sys/sys/cpu.h
@@ -36,7 +36,7 @@
  */
 
 enum {
-	CPU_IVAR_PCPU = BUS_IVARS_PRIVATE + 1,
+	CPU_IVAR_PCPU = BUS_IVARS_PRIVATE,
 	CPU_IVAR_NOMINAL_MHZ,
 	CPU_IVAR_CPUID_SIZE,
 	CPU_IVAR_CPUID