diff --git a/3B2/3b2_400_stddev.c b/3B2/3b2_400_stddev.c
index cd8afa92..691e32ac 100644
--- a/3B2/3b2_400_stddev.c
+++ b/3B2/3b2_400_stddev.c
@@ -38,8 +38,6 @@
    - tod         MM58174A Real-Time-Clock
 */
 
-#include <time.h>
-
 #include "3b2_defs.h"
 #include "3b2_400_stddev.h"
 
diff --git a/BESM6/besm6_cpu.c b/BESM6/besm6_cpu.c
index ce3641bf..fcbbddcd 100644
--- a/BESM6/besm6_cpu.c
+++ b/BESM6/besm6_cpu.c
@@ -53,7 +53,6 @@
 #include "besm6_defs.h"
 #include <math.h>
 #include <float.h>
-#include <time.h>
 
 
 t_value memory [MEMSIZE];
diff --git a/BESM6/besm6_tty.c b/BESM6/besm6_tty.c
index 0efe2e89..67d59d80 100644
--- a/BESM6/besm6_tty.c
+++ b/BESM6/besm6_tty.c
@@ -30,7 +30,6 @@
 #include "besm6_defs.h"
 #include "sim_sock.h"
 #include "sim_tmxr.h"
-#include <time.h>
 
 #define TTY_MAX         24              /* Serial TTY lines */
 #define LINES_MAX       TTY_MAX + 2     /* Including parallel "Consul" typewriters */
diff --git a/PDP10/pdp10_tim.c b/PDP10/pdp10_tim.c
index 7a6adf14..713fe844 100644
--- a/PDP10/pdp10_tim.c
+++ b/PDP10/pdp10_tim.c
@@ -41,7 +41,6 @@
 
 #include "pdp10_defs.h"
 #include <math.h>
-#include <time.h>
 
 /* The KS timer works off a 4.100 MHz (243.9024 nsec) oscillator that
  * is independent of all other system timing.
diff --git a/PDP11/pdp11_cpumod.c b/PDP11/pdp11_cpumod.c
index c64a4106..15e804cf 100644
--- a/PDP11/pdp11_cpumod.c
+++ b/PDP11/pdp11_cpumod.c
@@ -48,7 +48,6 @@
 
 #include "pdp11_defs.h"
 #include "pdp11_cpumod.h"
-#include <time.h>
 
 /* Byte write macros for system registers */