diff --git a/src/commands.c b/src/commands.c
index 8a483bdd..cacbfc86 100644
--- a/src/commands.c
+++ b/src/commands.c
@@ -515,12 +515,12 @@ fatal_error_signal (int sig)
       DWORD susp_count = SuspendThread (main_thread);
 
       if (susp_count != 0)
-        fprintf (stderr, "SuspendThread: suspend count = %ld\n", susp_count);
+        fprintf (stderr, "SuspendThread: suspend count = %lu\n", susp_count);
       else if (susp_count == (DWORD)-1)
         {
           DWORD ierr = GetLastError ();
 
-          fprintf (stderr, "SuspendThread: error %ld: %s\n",
+          fprintf (stderr, "SuspendThread: error %lu: %s\n",
                    ierr, map_windows32_error_to_string (ierr));
         }
     }
diff --git a/src/function.c b/src/function.c
index 75aa1ca6..0f9b6091 100644
--- a/src/function.c
+++ b/src/function.c
@@ -1644,7 +1644,7 @@ windows32_openpipe (int *pipedes, int errfd, pid_t *pid_p, char **command_argv,
       if (hIn == INVALID_HANDLE_VALUE)
         {
           ON (error, NILF,
-              _("windows32_openpipe: DuplicateHandle(In) failed (e=%ld)\n"), e);
+              _("windows32_openpipe: DuplicateHandle(In) failed (e=%lu)\n"), e);
           return -1;
         }
     }
@@ -1668,14 +1668,14 @@ windows32_openpipe (int *pipedes, int errfd, pid_t *pid_p, char **command_argv,
       if (hErr == INVALID_HANDLE_VALUE)
         {
           ON (error, NILF,
-              _("windows32_openpipe: DuplicateHandle(Err) failed (e=%ld)\n"), e);
+              _("windows32_openpipe: DuplicateHandle(Err) failed (e=%lu)\n"), e);
           return -1;
         }
     }
 
   if (! CreatePipe (&hChildOutRd, &hChildOutWr, &saAttr, 0))
     {
-      ON (error, NILF, _("CreatePipe() failed (e=%ld)\n"), GetLastError());
+      ON (error, NILF, _("CreatePipe() failed (e=%lu)\n"), GetLastError());
       return -1;
     }