diff --git a/dsim.c b/dsim.c
index 86f23bb..f58bf72 100644
--- a/dsim.c
+++ b/dsim.c
@@ -525,12 +525,14 @@ int load_image(char *filename)
     int fd;
     ssize_t r;
     ssize_t pos;
+    uint8_t *buf;
 
     fd = open(filename, O_RDONLY);
     if (fd < 0)
         return fd;
+    buf = (uint8_t *)ram;
     for (pos=0;;) {
-        r = read(fd, &ram[pos], sizeof(ram));
+        r = read(fd, &buf[pos], sizeof(ram)-pos);
         if (r > 0)
             pos += r;
         else {