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-rw-r--r--include/stdc-predef.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/stdc-predef.h b/include/stdc-predef.h
index af1a2799..642bad2d 100644
--- a/include/stdc-predef.h
+++ b/include/stdc-predef.h
@@ -7,7 +7,12 @@
 #define __STDC_IEC_559__ 1
 #endif
 
+#if !defined(__STDC_UTF_16__)
 #define __STDC_UTF_16__ 1
+#endif
+
+#if !defined(__STDC_UTF_32__)
 #define __STDC_UTF_32__ 1
+#endif
 
 #endif