diff --git a/busexmp.c b/busexmp.c
index 9b01f7c..f5fa75a 100644
--- a/busexmp.c
+++ b/busexmp.c
@@ -5,33 +5,40 @@
 #include "buse.h"
 
 static void *data;
+static int xmpl_debug = 1;
 
 static int xmp_read(void *buf, u_int32_t len, u_int64_t offset, void *userdata)
 {
-  fprintf(stderr, "R - %lu, %u\n", offset, len);
+  if (*(int *)userdata)
+    fprintf(stderr, "R - %lu, %u\n", offset, len);
   memcpy(buf, (char *)data + offset, len);
   return 0;
 }
 
 static int xmp_write(const void *buf, u_int32_t len, u_int64_t offset, void *userdata)
 {
-  fprintf(stderr, "W - %lu, %u\n", offset, len);
+  if (*(int *)userdata)
+    fprintf(stderr, "W - %lu, %u\n", offset, len);
   memcpy((char *)data + offset, buf, len);
   return 0;
 }
 
 static void xmp_disc(void *userdata)
 {
+  (void)(userdata);
   fprintf(stderr, "Received a disconnect request.\n");
 }
 
 static int xmp_flush(void *userdata)
 {
+  (void)(userdata);
   fprintf(stderr, "Received a flush request.\n");
   return 0;
 }
 
-static int xmp_trim(u_int64_t from, u_int32_t len, void *userdata){
+static int xmp_trim(u_int64_t from, u_int32_t len, void *userdata)
+{
+  (void)(userdata);
   fprintf(stderr, "T - %lu, %u\n", from, len);
   return 0;
 }
@@ -48,7 +55,8 @@ static struct buse_operations aop = {
 
 int main(int argc, char *argv[])
 {
+  (void)(argc);
   data = malloc(aop.size);
 
-  return buse_main(argv[1], &aop, NULL);
+  return buse_main(argv[1], &aop, (void *)&xmpl_debug);
 }
diff --git a/loopback.c b/loopback.c
index 4e90f34..f491d59 100644
--- a/loopback.c
+++ b/loopback.c
@@ -21,6 +21,7 @@ static void usage(void)
 static int loopback_read(void *buf, u_int32_t len, u_int64_t offset, void *userdata)
 {
     int bytes_read;
+    (void)(userdata);
 
     lseek64(fd, offset, SEEK_SET);
     while (len > 0) {
@@ -36,6 +37,7 @@ static int loopback_read(void *buf, u_int32_t len, u_int64_t offset, void *userd
 static int loopback_write(const void *buf, u_int32_t len, u_int64_t offset, void *userdata)
 {
     int bytes_written;
+    (void)(userdata);
 
     lseek64(fd, offset, SEEK_SET);
     while (len > 0) {