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-rw-r--r--include/ruby/internal/stdbool.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/internal/stdbool.h b/include/ruby/internal/stdbool.h
index 1ca61136ba..e9dee46b38 100644
--- a/include/ruby/internal/stdbool.h
+++ b/include/ruby/internal/stdbool.h
@@ -27,7 +27,7 @@
#elif defined(__cplusplus)
# /* bool is a keyword in C++. */
-# if defined(HAVE_STDBOOL_H) && (__cplusplus >= 201103L)
+# if defined(HAVE_STDBOOL_H) && (__cplusplus >= 201103L) && (__cplusplus < 201703L)
# include <cstdbool>
# endif
#