diff --git a/sys/amd64/amd64/fpu.c b/sys/amd64/amd64/fpu.c
index 1807ba915023..1238d67a6311 100644
--- a/sys/amd64/amd64/fpu.c
+++ b/sys/amd64/amd64/fpu.c
@@ -997,5 +997,7 @@ static driver_t npxisa_driver = {
 static devclass_t npxisa_devclass;
 
 DRIVER_MODULE(npxisa, isa, npxisa_driver, npxisa_devclass, 0, 0);
+#ifndef PC98
 DRIVER_MODULE(npxisa, acpi, npxisa_driver, npxisa_devclass, 0, 0);
+#endif
 
diff --git a/sys/amd64/isa/npx.c b/sys/amd64/isa/npx.c
index 1807ba915023..1238d67a6311 100644
--- a/sys/amd64/isa/npx.c
+++ b/sys/amd64/isa/npx.c
@@ -997,5 +997,7 @@ static driver_t npxisa_driver = {
 static devclass_t npxisa_devclass;
 
 DRIVER_MODULE(npxisa, isa, npxisa_driver, npxisa_devclass, 0, 0);
+#ifndef PC98
 DRIVER_MODULE(npxisa, acpi, npxisa_driver, npxisa_devclass, 0, 0);
+#endif
 
diff --git a/sys/i386/isa/npx.c b/sys/i386/isa/npx.c
index 1807ba915023..1238d67a6311 100644
--- a/sys/i386/isa/npx.c
+++ b/sys/i386/isa/npx.c
@@ -997,5 +997,7 @@ static driver_t npxisa_driver = {
 static devclass_t npxisa_devclass;
 
 DRIVER_MODULE(npxisa, isa, npxisa_driver, npxisa_devclass, 0, 0);
+#ifndef PC98
 DRIVER_MODULE(npxisa, acpi, npxisa_driver, npxisa_devclass, 0, 0);
+#endif