diff --git a/v2v/convert_linux.ml b/v2v/convert_linux.ml
index 2cfe3a7a6..cadfbb53d 100644
--- a/v2v/convert_linux.ml
+++ b/v2v/convert_linux.ml
@@ -254,11 +254,11 @@ let rec convert ~keep_serial_console (g : G.guestfs) inspect source rcaps =
     ) inspect.i_apps in
 
   if verbose () then (
-    printf "installed kernel packages in this guest:\n";
+    eprintf "installed kernel packages in this guest:\n";
     List.iter (
-      fun kernel -> printf "\t%s\n" (string_of_kernel_info kernel)
+      fun kernel -> eprintf "\t%s\n" (string_of_kernel_info kernel)
     ) installed_kernels;
-    flush stdout
+    flush stderr
   );
 
   if installed_kernels = [] then
@@ -374,11 +374,11 @@ let rec convert ~keep_serial_console (g : G.guestfs) inspect source rcaps =
     ) vmlinuzes in
 
   if verbose () then (
-    printf "grub kernels in this guest (first in list is default):\n";
+    eprintf "grub kernels in this guest (first in list is default):\n";
     List.iter (
-      fun kernel -> printf "\t%s\n" (string_of_kernel_info kernel)
+      fun kernel -> eprintf "\t%s\n" (string_of_kernel_info kernel)
     ) grub_kernels;
-    flush stdout
+    flush stderr
   );
 
   if grub_kernels = [] then
@@ -1301,12 +1301,12 @@ let rec convert ~keep_serial_console (g : G.guestfs) inspect source rcaps =
       ) source.s_disks in
 
     if verbose () then (
-      printf "block device map:\n";
+      eprintf "block device map:\n";
       List.iter (
         fun (source_dev, target_dev) ->
-          printf "\t%s\t-> %s\n" source_dev target_dev
+          eprintf "\t%s\t-> %s\n" source_dev target_dev
       ) (List.sort (fun (a,_) (b,_) -> compare a b) map);
-      flush stdout
+      flush stderr
     );
 
     (* Possible Augeas paths to search for device names. *)
diff --git a/v2v/linux.ml b/v2v/linux.ml
index 01aaf7d0e..e1451a407 100644
--- a/v2v/linux.ml
+++ b/v2v/linux.ml
@@ -72,28 +72,28 @@ and augeas_debug_errors g =
 
     List.iter (
       fun filename ->
-        printf "augeas failed to parse %s:\n" filename;
+        eprintf "augeas failed to parse %s:\n" filename;
         let fmap = StringMap.find filename map in
         (try
            let msg = StringMap.find "message" fmap in
-           printf " error \"%s\"" msg
+           eprintf " error \"%s\"" msg
          with Not_found -> ()
         );
         (try
            let line = StringMap.find "line" fmap
            and char = StringMap.find "char" fmap in
-           printf " at line %s char %s" line char
+           eprintf " at line %s char %s" line char
          with Not_found -> ()
         );
         (try
            let lens = StringMap.find "lens" fmap in
-           printf " in lens %s" lens
+           eprintf " in lens %s" lens
          with Not_found -> ()
         );
-        printf "\n"
+        eprintf "\n"
     ) filenames;
 
-    flush stdout
+    flush stderr
   with
     Guestfs.Error msg -> eprintf "%s: augeas: %s (ignored)\n" prog msg
 
diff --git a/v2v/output_glance.ml b/v2v/output_glance.ml
index fef762014..3fef31e3b 100644
--- a/v2v/output_glance.ml
+++ b/v2v/output_glance.ml
@@ -127,11 +127,11 @@ object
         if run_command cmd <> 0 then (
           warning (f_"glance: failed to set image properties (ignored)");
           (* Dump out the image properties so the user can set them. *)
-          printf "Image properties:\n";
-          printf "  --min-ram %Ld\n" min_ram;
+          eprintf "Image properties:\n";
+          eprintf "  --min-ram %Ld\n" min_ram;
           List.iter (
 	    fun (k, v) ->
-	      printf "  --property %s=%s" (quote k) (quote v)
+	      eprintf "  --property %s=%s" (quote k) (quote v)
           ) properties
         )
       ) targets
diff --git a/v2v/v2v.ml b/v2v/v2v.ml
index 5483ed678..9f25ff917 100644
--- a/v2v/v2v.ml
+++ b/v2v/v2v.ml
@@ -322,8 +322,8 @@ and get_mpstats g =
 
   if verbose () then (
     (* This is useful for debugging speed / fstrim issues. *)
-    printf "mpstats:\n";
-    List.iter (print_mpstat Pervasives.stdout) mpstats
+    eprintf "mpstats:\n";
+    List.iter (print_mpstat Pervasives.stderr) mpstats
   );
 
   mpstats
@@ -654,14 +654,14 @@ and copy_targets cmdline targets input output =
           Int64.to_float size /. 1024. /. 1024. *. 10. /. time
         in
 
-        printf "virtual copying rate: %.1f M bits/sec\n%!"
+        eprintf "virtual copying rate: %.1f M bits/sec\n%!"
           (mbps t.target_overlay.ov_virtual_size elapsed_time);
 
         match t.target_actual_size with
         | None -> ()
         | Some actual ->
-          printf "real copying rate: %.1f M bits/sec\n%!"
-            (mbps actual elapsed_time)
+           eprintf "real copying rate: %.1f M bits/sec\n%!"
+                   (mbps actual elapsed_time)
       );
 
       (* If verbose, find out how close the estimate was.  This is
@@ -675,13 +675,13 @@ and copy_targets cmdline targets input output =
           let pc =
             100. *. Int64.to_float estimate /. Int64.to_float actual
             -. 100. in
-          printf "%s: estimate %Ld (%s) versus actual %Ld (%s): %.1f%%"
+          eprintf "%s: estimate %Ld (%s) versus actual %Ld (%s): %.1f%%"
             t.target_overlay.ov_sd
             estimate (human_size estimate)
             actual (human_size actual)
             pc;
-          if pc < 0. then printf " ! ESTIMATE TOO LOW !";
-          printf "\n%!";
+          if pc < 0. then eprintf " ! ESTIMATE TOO LOW !";
+          eprintf "\n%!";
       );
 
       t
@@ -703,7 +703,7 @@ and preserve_overlays overlays src_name =
       let saved_filename =
         sprintf "%s/%s-%s.qcow2" overlay_dir src_name ov.ov_sd in
       rename ov.ov_overlay_file saved_filename;
-      printf (f_"Overlay saved as %s [--debug-overlays]\n") saved_filename
+      info (f_"Overlay saved as %s [--debug-overlays]") saved_filename
   ) overlays
 
 (* Request guest caps based on source configuration. *)