diff --git a/math/log.c b/math/log.c
index a0a0c15..51567fc 100644
--- a/math/log.c
+++ b/math/log.c
@@ -15,7 +15,7 @@ double _agm(double x, double y) {
 }
 
 double log(double x) {
-  double s = x * exp2(24);
+  double s = x * 16777216;
   double nat_log = (M_PI / (2 * _agm(1, 4/s))) - (24 * M_LN2);
   return nat_log;
 }
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