--- libxlsxwriter-RELEASE_0.7.7/include/xlsxwriter/utility.h	2018-05-17 01:42:39.000000000 +0200
+++ libxlsxwriter-RELEASE_0.7.7/include/xlsxwriter/utility.h	2018-05-30 03:23:23.884362320 +0200
@@ -156,12 +156,7 @@ 
 
 /* Use a user defined function to format doubles in sprintf or else a simple
  * macro (the default). */
-#ifdef USE_DOUBLE_FUNCTION
 int lxw_sprintf_dbl(char *data, double number);
-#else
-#define lxw_sprintf_dbl(data, number) \
-        lxw_snprintf(data, LXW_ATTR_32, "%.16g", number)
-#endif
 
 /* *INDENT-OFF* */
 #ifdef __cplusplus
--- libxlsxwriter-RELEASE_0.7.7/src/utility.c	2018-05-17 01:42:39.000000000 +0200
+++ libxlsxwriter-RELEASE_0.7.7/src/utility.c	2018-05-30 03:21:41.551538640 +0200
@@ -537,7 +537,6 @@ 
  * 123.45. End-users can replace this with something more rigorous if
  * required.
  */
-#ifdef USE_DOUBLE_FUNCTION
 int
 lxw_sprintf_dbl(char *data, double number)
 {
@@ -552,4 +551,3 @@ 
 
     return 0;
 }
-#endif
--- libxlsxwriter-RELEASE_0.7.7/src/worksheet.c	2018-05-17 01:42:39.000000000 +0200
+++ libxlsxwriter-RELEASE_0.7.7/src/worksheet.c	2018-05-30 03:22:21.606861033 +0200
@@ -2495,7 +2495,6 @@ 
 _write_number_cell(lxw_worksheet *self, char *range,
                    int32_t style_index, lxw_cell *cell)
 {
-#ifdef USE_DOUBLE_FUNCTION
     char data[LXW_ATTR_32];
 
     lxw_sprintf_dbl(data, cell->u.number);
@@ -2506,16 +2505,6 @@ 
                 range, style_index, data);
     else
         fprintf(self->file, "<c r=\"%s\"><v>%s</v></c>", range, data);
-#else
-    if (style_index)
-        fprintf(self->file,
-                "<c r=\"%s\" s=\"%d\"><v>%.16g</v></c>",
-                range, style_index, cell->u.number);
-    else
-        fprintf(self->file,
-                "<c r=\"%s\"><v>%.16g</v></c>", range, cell->u.number);
-
-#endif
 }
 
 /*