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-rw-r--r--missing/cbrt.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/missing/cbrt.c b/missing/cbrt.c
index 54db2703a0..1bcbc63392 100644
--- a/missing/cbrt.c
+++ b/missing/cbrt.c
@@ -1,3 +1,4 @@
+#include "ruby/missing.h"
#include <math.h>
double cbrt(double x)