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-rw-r--r--Src/system.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Src/system.h b/Src/system.h
index b1c7481b7..f434b586e 100644
--- a/Src/system.h
+++ b/Src/system.h
@@ -689,6 +689,7 @@ extern short ospeed;
  */
 #if defined(HAVE_WCHAR_H) && defined(HAVE_WCTOMB) && defined (__STDC_ISO_10646__)
 # include <wchar.h>
+# include <wctype.h>
 
 /*
  * More stringent requirements to enable complete Unicode conversion