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-rw-r--r--mrbgems/mruby-rational/src/rational.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mrbgems/mruby-rational/src/rational.c b/mrbgems/mruby-rational/src/rational.c
index c63769a31..7ace64dab 100644
--- a/mrbgems/mruby-rational/src/rational.c
+++ b/mrbgems/mruby-rational/src/rational.c
@@ -2,6 +2,7 @@
#include <mruby/class.h>
#include <mruby/string.h>
#include <mruby/numeric.h>
+#include <mruby/presym.h>
struct mrb_rational {
mrb_int numerator;