diff --git a/usr.bin/top/prime.c b/usr.bin/top/prime.c
deleted file mode 100644
index b0d65424b5e0..000000000000
--- a/usr.bin/top/prime.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * Prime number generator.  It prints on stdout the next prime number
- * higher than the number specified as argv[1].
- */
-
-#include <stdio.h>
-#include <math.h>
-
-main(argc, argv)
-
-int argc;
-char *argv[];
-
-{
-    double i, j;
-    int f;
-
-    if (argc < 2)
-    {
-	exit(1);
-    }
-
-    i = atoi(argv[1]);
-    while (i++)
-    {
-	f=1;
-	for (j=2; j<i; j++)
-	{
-	    if ((i/j)==floor(i/j))
-	    {
-		f=0;
-		break;
-	    }
-	}
-	if (f)
-	{
-	    printf("%.0f\n", i);
-	    exit(0);
-	}
-    }
-}