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-rw-r--r--src/internal/stdio_impl.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/internal/stdio_impl.h b/src/internal/stdio_impl.h
index 44497344..055ef718 100644
--- a/src/internal/stdio_impl.h
+++ b/src/internal/stdio_impl.h
@@ -106,7 +106,8 @@ hidden void __getopt_msg(const char *, const char *, const char *, size_t);
#define putc_unlocked(c, f) \
( (((unsigned char)(c)!=(f)->lbf && (f)->wpos!=(f)->wend)) \
- ? *(f)->wpos++ = (c) : __overflow((f),(c)) )
+ ? *(f)->wpos++ = (unsigned char)(c) \
+ : __overflow((f),(unsigned char)(c)) )
/* Caller-allocated FILE * operations */
hidden FILE *__fopen_rb_ca(const char *, FILE *, unsigned char *, size_t);