diff --git a/util/viatool/Makefile b/util/viatool/Makefile
index de3bfdd515..4d9d0d0ea9 100644
--- a/util/viatool/Makefile
+++ b/util/viatool/Makefile
@@ -40,6 +40,10 @@ CFLAGS += -I/usr/local/include
 LDFLAGS += -L/usr/local/lib
 LIBS = -lz
 endif
+ifeq ($(OS_ARCH), NetBSD)
+CFLAGS += -I/usr/pkg/include
+LDFLAGS += -L/usr/pkg/lib -Wl,-rpath-link,/usr/pkg/lib -lz -lpciutils -lpci -l$(shell uname -p)
+endif
 
 all: pciutils dep $(PROGRAM)
 
@@ -62,7 +66,11 @@ dep:
 define LIBPCI_TEST
 /* Avoid a failing test due to libpci header symbol shadowing breakage */
 #define index shadow_workaround_index
+#ifdef __NetBSD__
+#include <pciutils/pci.h>
+#else
 #include <pci/pci.h>
+#endif
 struct pci_access *pacc;
 int main(int argc, char **argv)
 {
diff --git a/util/viatool/viatool.c b/util/viatool/viatool.c
index 0fde455c87..c19647fd0c 100644
--- a/util/viatool/viatool.c
+++ b/util/viatool/viatool.c
@@ -25,6 +25,10 @@
 #include <unistd.h>
 #include "viatool.h"
 
+#ifdef __NetBSD__
+#include <machine/sysarch.h>
+#endif
+
 /*
  * http://pci-ids.ucw.cz/read/PC/8086
  * http://en.wikipedia.org/wiki/Intel_Tick-Tock
@@ -146,6 +150,14 @@ int main(int argc, char *argv[])
 #if defined(__FreeBSD__)
 	if (open("/dev/io", O_RDWR) < 0) {
 		perror("/dev/io");
+#elif defined(__NetBSD__)
+# ifdef __i386__
+	if (i386_iopl(3)) {
+		perror("iopl");
+# else
+	if (x86_64_iopl(3)) {
+		perror("iopl");
+# endif
 #else
 	if (iopl(3)) {
 		perror("iopl");
diff --git a/util/viatool/viatool.h b/util/viatool/viatool.h
index a0a5d79c94..3a6f04873d 100644
--- a/util/viatool/viatool.h
+++ b/util/viatool/viatool.h
@@ -28,13 +28,38 @@
 #define __DARWIN__
 #include <DirectHW/DirectHW.h>
 #endif
+#ifdef __NetBSD__
+#include <pciutils/pci.h>
+#else
 #include <pci/pci.h>
+#endif
 
 /* This #include is needed for freebsd_{rd,wr}msr. */
 #if defined(__FreeBSD__)
 #include <machine/cpufunc.h>
 #endif
 
+#ifdef __NetBSD__
+static inline uint8_t inb(unsigned port)
+{
+	uint8_t data;
+	__asm volatile("inb %w1,%0" : "=a" (data) : "d" (port));
+	return data;
+}
+static inline uint16_t inw(unsigned port)
+{
+	uint16_t data;
+	__asm volatile("inw %w1,%0": "=a" (data) : "d" (port));
+	return data;
+}
+static inline uint32_t inl(unsigned port)
+{
+	uint32_t data;
+	__asm volatile("inl %w1,%0": "=a" (data) : "d" (port));
+	return data;
+}
+#endif
+
 #include <stdlib.h>
 
 #define VIATOOL_VERSION "1.0"