diff --git a/sysutils/acpica-tools/Makefile b/sysutils/acpica-tools/Makefile
index 76c38c138274..970794f7a2c8 100644
--- a/sysutils/acpica-tools/Makefile
+++ b/sysutils/acpica-tools/Makefile
@@ -1,33 +1,33 @@
 PORTNAME=	acpica
-PORTVERSION=	20210930
+PORTVERSION=	20220331
 CATEGORIES=	sysutils devel
 MASTER_SITES=	https://acpica.org/sites/acpica/files/ \
 		LOCAL/jkim
 PKGNAMESUFFIX=	-tools
 DISTNAME=	${PORTNAME}-unix-${PORTVERSION}
 
 MAINTAINER=	jkim@FreeBSD.org
 COMMENT=	Tools from the ACPI Component Architecture (ACPICA) project
 
 LICENSE=	BSD3CLAUSE GPLv2
 LICENSE_COMB=	dual
 
 BROKEN_FreeBSD_12_powerpc64=	fails to compile on powerpc64 elfv1: comparison is always true due to limited range of data type
 
 USES=		gmake
 
 BUILD_WRKSRC=	${WRKSRC}/generate/unix
 
 ACPICA_TOOLS=	acpibin acpidump acpiexec acpihelp acpisrc
 ACPICA_TOOLS+=	acpixtract iasl
 
 PLIST_FILES=	${ACPICA_TOOLS:S,^,bin/,}
 
 MAKE_ARGS=	HOST=_FreeBSD PROGS="${ACPICA_TOOLS}"
 MAKE_ARGS+=	CC="${CC}" LEX="${FLEX}" YACC="${YACC}"
 
 do-install:
 	${INSTALL_PROGRAM} ${ACPICA_TOOLS:S,^,${BUILD_WRKSRC}/bin/,} \
 	    ${STAGEDIR}${PREFIX}/bin
 
 .include <bsd.port.mk>
diff --git a/sysutils/acpica-tools/distinfo b/sysutils/acpica-tools/distinfo
index 4a0f8b79469a..4e317a44f2f0 100644
--- a/sysutils/acpica-tools/distinfo
+++ b/sysutils/acpica-tools/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1633024977
-SHA256 (acpica-unix-20210930.tar.gz) = 3cd82a281a16bc70c2708665668f138c4fc606c31161d46ce77230454ec04821
-SIZE (acpica-unix-20210930.tar.gz) = 1898035
+TIMESTAMP = 1648758845
+SHA256 (acpica-unix-20220331.tar.gz) = acaff68b14f1e0804ebbfc4b97268a4ccbefcfa053b02ed9924f2b14d8a98e21
+SIZE (acpica-unix-20220331.tar.gz) = 1911044
diff --git a/sysutils/acpica-tools/files/patch-source_include_platform_acfreebsd.h b/sysutils/acpica-tools/files/patch-source_include_platform_acfreebsd.h
new file mode 100644
index 000000000000..b897a7b3b51b
--- /dev/null
+++ b/sysutils/acpica-tools/files/patch-source_include_platform_acfreebsd.h
@@ -0,0 +1,10 @@
+--- source/include/platform/acfreebsd.h.orig	2022-03-31 16:38:39 UTC
++++ source/include/platform/acfreebsd.h
+@@ -211,6 +211,7 @@
+ 
+ #if __STDC_HOSTED__
+ #include <ctype.h>
++#include <unistd.h>
+ #endif
+ 
+ #define ACPI_CAST_PTHREAD_T(pthread)    ((ACPI_THREAD_ID) ACPI_TO_INTEGER (pthread))