diff --git a/sys/dev/en/midway.c b/sys/dev/en/midway.c
index aaa8570b0b7..34ceff45acf 100644
--- a/sys/dev/en/midway.c
+++ b/sys/dev/en/midway.c
@@ -126,7 +126,6 @@ enum {
 
 #include <sys/param.h>
 #include <sys/systm.h>
-#include <sys/kdb.h>
 #include <sys/queue.h>
 #include <sys/sockio.h>
 #include <sys/socket.h>
diff --git a/sys/fs/nullfs/null_vfsops.c b/sys/fs/nullfs/null_vfsops.c
index dd2bab2a91a..21ee108d2ee 100644
--- a/sys/fs/nullfs/null_vfsops.c
+++ b/sys/fs/nullfs/null_vfsops.c
@@ -42,7 +42,6 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
-#include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c
index 9e9895c004d..fa87a2494c3 100644
--- a/sys/fs/nullfs/null_vnops.c
+++ b/sys/fs/nullfs/null_vnops.c
@@ -180,7 +180,6 @@
 #include <sys/namei.h>
 #include <sys/sysctl.h>
 #include <sys/vnode.h>
-#include <sys/kdb.h>
 
 #include <fs/nullfs/null.h>
 
diff --git a/sys/fs/smbfs/smbfs_node.c b/sys/fs/smbfs/smbfs_node.c
index 37f2af77552..84fa330fe06 100644
--- a/sys/fs/smbfs/smbfs_node.c
+++ b/sys/fs/smbfs/smbfs_node.c
@@ -33,7 +33,6 @@
  */
 #include <sys/param.h>
 #include <sys/systm.h>
-#include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
diff --git a/sys/pci/ncr.c b/sys/pci/ncr.c
index 851c43f981c..2aea447a287 100644
--- a/sys/pci/ncr.c
+++ b/sys/pci/ncr.c
@@ -180,7 +180,6 @@ __FBSDID("$FreeBSD$");
 #ifdef _KERNEL
 #include <sys/systm.h>
 #include <sys/malloc.h>
-#include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/module.h>
 #include <sys/sysctl.h>