diff --git a/squiggle.c b/squiggle.c
index fe80ca9..8db93d0 100644
--- a/squiggle.c
+++ b/squiggle.c
@@ -13,7 +13,7 @@
 #define PROCESS_ERROR(error_msg) process_error(error_msg, EXIT_ON_ERROR, __FILE__, __LINE__)
 
 #define PI 3.14159265358979323846 // M_PI in gcc gnu99
-#define NORMAL90CONFIDENCE 1.6448536269514722
+#define NORMAL90CONFIDENCE 1.6448536269514727
 
 // # Key functionality
 // Define the minimum number of functions needed to do simple estimation