diff --git a/sim_disk.c b/sim_disk.c
index 57f64c32..5599b6a8 100644
--- a/sim_disk.c
+++ b/sim_disk.c
@@ -1147,14 +1147,14 @@ fprintf (st, "%s Disk Attach Help\n\n", dptr->name);
 fprintf (st, "Disk container files can be one of 3 different types:\n\n");
 fprintf (st, "    SIMH   A disk is an unstructured binary file of the size appropriate\n");
 fprintf (st, "           for the disk drive being simulated\n");
-fprintf (st, "    VHD    Virtual Disk format which is described in the “Microsoft\n");
-fprintf (st, "           Virtual Hard Disk (VHD) Image Format Specification”.  The\n");
+fprintf (st, "    VHD    Virtual Disk format which is described in the \"Microsoft\n");
+fprintf (st, "           Virtual Hard Disk (VHD) Image Format Specification\".  The\n");
 fprintf (st, "           VHD implementation includes support for 1) Fixed (Preallocated)\n");
 fprintf (st, "           disks, 2) Dynamically Expanding disks, and 3) Differencing disks.\n");
 fprintf (st, "    RAW    platform specific access to physical disk or CDROM drives\n\n");
-fprintf (st, "Virtual (VHD) Disks  supported conform to “Virtual Hard Disk Image Format\n");
-fprintf (st, "Specification”, Version 1.0 October 11, 2006.\n");
-fprintf (st, "Dynamically expanding disks never change their “Virtual Size”, but they don’t\n");
+fprintf (st, "Virtual (VHD) Disks  supported conform to \"Virtual Hard Disk Image Format\n");
+fprintf (st, "Specification\", Version 1.0 October 11, 2006.\n");
+fprintf (st, "Dynamically expanding disks never change their \"Virtual Size\", but they don't\n");
 fprintf (st, "consume disk space on the containing storage until the virtual sectors in the\n");
 fprintf (st, "disk are actually written to (i.e. a 2GB Dynamic disk container file with only\n");
 fprintf (st, "30MB of data will initially be about 30MB in size and this size will grow up to\n");