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-rw-r--r--stdio-common/vfscanf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/stdio-common/vfscanf.c b/stdio-common/vfscanf.c
index 603940da4c..ac6fcdf79f 100644
--- a/stdio-common/vfscanf.c
+++ b/stdio-common/vfscanf.c
@@ -119,7 +119,7 @@
 # define ISSPACE(Ch)	  __isspace_l (Ch, loc)
 # define ISDIGIT(Ch)	  __isdigit_l (Ch, loc)
 # define ISXDIGIT(Ch)	  __isxdigit_l (Ch, loc)
-# define TOLOWER(Ch)	  __tolower_l (Ch, loc)
+# define TOLOWER(Ch)	  __tolower_l ((unsigned char) (Ch), loc)
 # define ORIENT	  if (_IO_vtable_offset (s) == 0			      \
 			      && _IO_fwide (s, -1) != -1)		      \
 			    return EOF