diff --git a/opal/include/opal_stdint.h b/opal/include/opal_stdint.h
index 10f098358c..be5f799d73 100644
--- a/opal/include/opal_stdint.h
+++ b/opal/include/opal_stdint.h
@@ -312,12 +312,12 @@ typedef unsigned long long uintptr_t;
 #ifndef PRIsize_t
 # if defined(ACCEPT_C99)
 #   define PRIsize_t "zu"
-# elif SIZEOF_SIZE_T == SIZEOF_INT
-#   define PRIsize_t "u"
 # elif SIZEOF_SIZE_T == SIZEOF_LONG
 #   define PRIsize_t "lu"
 # elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
 #   define PRIsize_t "llu"
+# else
+#   define PRIsize_t "u"
 # endif
 #endif