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-rw-r--r--internal/math.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal/math.h b/internal/math.h
index 51d398f..ec46f47 100644
--- a/internal/math.h
+++ b/internal/math.h
@@ -9,6 +9,7 @@
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
*/
+#include "ruby/ruby.h" /* for VALUE */
/* math.c */
VALUE rb_math_atan2(VALUE, VALUE);