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-rw-r--r--math.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/math.c b/math.c
index 63a3863..c7e79c1 100644
--- a/math.c
+++ b/math.c
@@ -15,6 +15,7 @@
VALUE rb_mMath;
+extern VALUE rb_to_float(VALUE val);
#define Need_Float(x) (x) = rb_to_float(x)
#define Need_Float2(x,y) do {\
Need_Float(x);\