diff --git a/main/share/gb_limit.h b/main/share/gb_limit.h
index ed26ac582..da4b40039 100644
--- a/main/share/gb_limit.h
+++ b/main/share/gb_limit.h
@@ -97,7 +97,7 @@
 #define MAX_STRUCT_FIELD    255
 
 /* Maximum number of digits in a Float */
-#define MAX_FLOAT_DIGIT     16
+#define MAX_FLOAT_DIGIT     15
 
 #endif