diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c
--- a/sys/amd64/amd64/trap.c
+++ b/sys/amd64/amd64/trap.c
@@ -47,7 +47,6 @@
  */
 
 #include "opt_clock.h"
-#include "opt_compat.h"
 #include "opt_cpu.h"
 #include "opt_hwpmc_hooks.h"
 #include "opt_isa.h"
diff --git a/sys/conf/options b/sys/conf/options
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -100,7 +100,6 @@
 COMPAT_FREEBSD12	opt_global.h
 COMPAT_FREEBSD13	opt_global.h
 COMPAT_LINUXKPI	opt_dontuse.h
-_COMPAT_LINUX32	opt_compat.h	# XXX: make sure opt_compat.h exists
 COMPILING_LINT	opt_global.h
 CY_PCI_FASTINTR
 DEADLKRES	opt_watchdog.h
diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c
--- a/sys/i386/i386/trap.c
+++ b/sys/i386/i386/trap.c
@@ -47,7 +47,6 @@
  */
 
 #include "opt_clock.h"
-#include "opt_compat.h"
 #include "opt_cpu.h"
 #include "opt_hwpmc_hooks.h"
 #include "opt_isa.h"
diff --git a/sys/modules/crypto/Makefile b/sys/modules/crypto/Makefile
--- a/sys/modules/crypto/Makefile
+++ b/sys/modules/crypto/Makefile
@@ -98,7 +98,6 @@
 CFLAGS.curve25519.c		+= -I${LIBSODIUM_INC} -I${LIBSODIUM_COMPAT}
 
 SRCS	+= opt_param.h cryptodev_if.h bus_if.h device_if.h
-SRCS	+= opt_compat.h
 SRCS	+= opt_ddb.h
 SRCS	+= cbc_mac.c
 SRCS	+= xform_cbc_mac.c
diff --git a/sys/opencrypto/crypto.c b/sys/opencrypto/crypto.c
--- a/sys/opencrypto/crypto.c
+++ b/sys/opencrypto/crypto.c
@@ -58,7 +58,6 @@
  * PURPOSE.
  */
 
-#include "opt_compat.h"
 #include "opt_ddb.h"
 
 #include <sys/param.h>