1 files changed, 3 insertions, 3 deletions
diff --git a/math.c b/math.c
index 39bc48aa1c..85e85bc75b 100644
--- a/math.c
+++ b/math.c
@@ -22,11 +22,11 @@ VALUE rb_mMath;
 }
 
 static VALUE
-math_atan2(obj, x, y)
+math_atan2(obj, y, x)
     VALUE obj, x, y;
 {
-    Need_Float2(x, y);
-    return rb_float_new(atan2(RFLOAT(x)->value, RFLOAT(y)->value));
+    Need_Float2(y, x);
+    return rb_float_new(atan2(RFLOAT(y)->value, RFLOAT(x)->value));
 }
 
 static VALUE