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-rw-r--r--include/ruby/util.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/util.h b/include/ruby/util.h
index e6e6c95ca4..fc5963c3a2 100644
--- a/include/ruby/util.h
+++ b/include/ruby/util.h
@@ -45,7 +45,7 @@ unsigned long ruby_scan_oct(const char *, int, int *);
#define scan_hex ruby_scan_hex
unsigned long ruby_scan_hex(const char *, int, int *);
-#if defined(MSDOS) || defined(__CYGWIN32__) || defined(_WIN32)
+#if defined(__CYGWIN32__) || defined(_WIN32)
void ruby_add_suffix(VALUE str, const char *suffix);
#endif