diff --git a/gcc/ada/adaint.c b/gcc/ada/adaint.c
index c13135788a60..03a0ff435a93 100644
--- a/gcc/ada/adaint.c
+++ b/gcc/ada/adaint.c
@@ -983,8 +983,12 @@ void
 __gnat_tmp_name (char *tmp_filename)
 {
 #ifdef RTX
-  /* RTX in RTSS mode does not support tempnam nor tmpnam */
-  strcpy (tmp_filename, "c:\\WINDOWS\\Temp\\gnat-XXXXXX");
+  /* Variable used to create a series of unique names */
+  static int counter = 0;
+
+  /* RTX in RTSS mode does not support tempnam nor tmpnam so we emulate it */
+  strcpy (tmp_filename, "c:\\WINDOWS\\Temp\\gnat-");
+  sprintf (&tmp_filename[strlen (tmp_filename)], "%d\0", counter++);
 
 #elif defined (__MINGW32__)
   {