diff --git a/windows/windDebug.c b/windows/windDebug.c
index a4cd11a8..d6c1844a 100644
--- a/windows/windDebug.c
+++ b/windows/windDebug.c
@@ -21,6 +21,7 @@ static char rcsid[] __attribute__ ((unused)) = "$Header$";
 #endif  /* not lint */
 
 #include <stdio.h>
+#include <stdint.h>
 
 #include "utils/magic.h"
 #include "utils/geometry.h"
@@ -106,9 +107,9 @@ windDump()
     for (rc = windFirstClientRec; rc != (clientRec * ) NULL;
 	rc = rc->w_nextClient)
     {
-	TxPrintf("'%10s'  %x %x %x %x\n", rc->w_clientName,
-	    rc->w_create, rc->w_delete,
-	    rc->w_redisplay, rc->w_command);
+	TxPrintf("'%10s'  %lx %lx %lx %lx\n", rc->w_clientName,
+	    (intmax_t) rc->w_create, (intmax_t) rc->w_delete,
+	    (intmax_t) rc->w_redisplay, (intmax_t) rc->w_command);
     }
 
     TxPrintf("\n");