diff --git a/include/minix/com.h b/include/minix/com.h
index 756f73a67..887ba5d4d 100644
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -482,7 +482,6 @@
 #   define GET_SCHEDINFO  10	/* get scheduling queues */
 #   define GET_PROC 	  11	/* get process slot if given process */
 #   define GET_MACHINE 	  12	/* get machine information */
-#   define GET_LOCKTIMING 13	/* get lock()/unlock() latency timing */
 #   define GET_BIOSBUFFER 14	/* get a buffer for BIOS calls */
 #   define GET_LOADINFO   15	/* get load average information */
 #   define GET_IRQACTIDS  16	/* get the IRQ masks */
diff --git a/include/minix/syslib.h b/include/minix/syslib.h
index 3353d3401..a25352b02 100644
--- a/include/minix/syslib.h
+++ b/include/minix/syslib.h
@@ -194,7 +194,6 @@ _PROTOTYPE(int sys_segctl, (int *index, u16_t *seg, vir_bytes *off,
 #define sys_getirqactids(dst)	sys_getinfo(GET_IRQACTIDS, dst, 0,0,0)
 #define sys_getmonparams(v,vl)	sys_getinfo(GET_MONPARAMS, v,vl, 0,0)
 #define sys_getschedinfo(v1,v2)	sys_getinfo(GET_SCHEDINFO, v1,0, v2,0)
-#define sys_getlocktimings(dst)	sys_getinfo(GET_LOCKTIMING, dst, 0,0,0)
 #define sys_getpriv(dst, nr)	sys_getinfo(GET_PRIV, dst, 0,0, nr)
 #define sys_getidletsc(dst)	sys_getinfo(GET_IDLETSC, dst, 0,0,0)
 #define sys_getaoutheader(dst,nr) sys_getinfo(GET_AOUTHEADER, dst, 0,0,nr)