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-rw-r--r--Src/system.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/Src/system.h b/Src/system.h
index 34b06c583..a10b66fd8 100644
--- a/Src/system.h
+++ b/Src/system.h
@@ -53,7 +53,12 @@
 #endif
 
 #if defined(ZSH_CURSES_SOURCE) && defined(ZSH_CURSES_NEEDS_XOPEN)
-#define _XOPEN_SOURCE_EXTENDED 1
+# define _XOPEN_SOURCE_EXTENDED 1
+#else
+# ifdef MULTIBYTE_SUPPORT
+/* Needed for wcwidth() which is part of XSI */
+#  define _XOPEN_SOURCE 1
+# endif
 #endif
 
 /*