--- bc/execute.c
+++ bc/execute.c
@@ -293,7 +293,7 @@
 
 	case 'X': /* Random function. */
 	  push_copy (_zero_);
-	  bc_int2num (&ex_stack->s_num, random());
+	  bc_int2num (&ex_stack->s_num, rand());
 	  break;
 	}
 	break;
--- bc/main.c
+++ bc/main.c
@@ -28,6 +28,7 @@
 /* main.c: The main program for bc.  */
 
 #include "bcdefs.h"
+#include <time.h>
 #include <signal.h>
 #include <errno.h>
 #include "proto.h"
@@ -222,6 +223,9 @@
   init_storage();
   init_load();
 
+  /* Seed the pseudo-random generator. */
+  srand(time(NULL));
+
   /* Set up interrupts to print a message. */
   if (interactive)
     signal (SIGINT, use_quit);