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-rw-r--r--include/ruby/internal/fl_type.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/internal/fl_type.h b/include/ruby/internal/fl_type.h
index 4696bfe2d3..1d570c4743 100644
--- a/include/ruby/internal/fl_type.h
+++ b/include/ruby/internal/fl_type.h
@@ -217,7 +217,7 @@ ruby_fl_type {
RBIMPL_FL_USER_N(16),
RBIMPL_FL_USER_N(17),
RBIMPL_FL_USER_N(18),
-#if ENUM_OVER_INT
+#ifdef ENUM_OVER_INT
RBIMPL_FL_USER_N(19),
#else
# define RUBY_FL_USER19 (RBIMPL_VALUE_ONE<<(RUBY_FL_USHIFT+19))