diff --git a/mach/sun2/libsys/syscall.h b/mach/sun2/libsys/syscall.h
index 408a60bc5..6a3639d76 100644
--- a/mach/sun2/libsys/syscall.h
+++ b/mach/sun2/libsys/syscall.h
@@ -118,7 +118,7 @@
 #define SYS_getdirentries 156
 #define SYS_statfs 157
 #define SYS_fstatfs 158
-#define SYS_unmount 159
+#define SYS_umount 159
 #define SYS_async_daemon 160
 #define SYS_getfh 161
 #define SYS_getdomainname 162
diff --git a/mach/sun2/libsys/unmount.s b/mach/sun2/libsys/unmount.s
index 4e23bd9f1..27da9a8ed 100644
--- a/mach/sun2/libsys/unmount.s
+++ b/mach/sun2/libsys/unmount.s
@@ -1,4 +1,4 @@
 #include "syscall.h"
 .sect .text; .sect .rom; .sect .data; .sect .bss; .sect .text
-.define _unmount
-_unmount: SYSTEM(SYS_unmount)
+.define _umount
+_umount: SYSTEM(SYS_unmount)
diff --git a/mach/sun3/libsys/syscall.h b/mach/sun3/libsys/syscall.h
index a510b65b3..190f0244a 100644
--- a/mach/sun3/libsys/syscall.h
+++ b/mach/sun3/libsys/syscall.h
@@ -118,7 +118,7 @@
 #define SYS_getdirentries 156
 #define SYS_statfs 157
 #define SYS_fstatfs 158
-#define SYS_unmount 159
+#define SYS_umount 159
 #define SYS_async_daemon 160
 #define SYS_getfh 161
 #define SYS_getdomainname 162
diff --git a/mach/sun3/libsys/unmount.s b/mach/sun3/libsys/unmount.s
index 4e23bd9f1..f323fa5f4 100644
--- a/mach/sun3/libsys/unmount.s
+++ b/mach/sun3/libsys/unmount.s
@@ -1,4 +1,4 @@
 #include "syscall.h"
 .sect .text; .sect .rom; .sect .data; .sect .bss; .sect .text
-.define _unmount
-_unmount: SYSTEM(SYS_unmount)
+.define _umount
+_umount: SYSTEM(SYS_umount)