diff --git a/src/gmio_core/internal/string_parse.c b/src/gmio_core/internal/string_parse.c
index c0d126e..241d353 100644
--- a/src/gmio_core/internal/string_parse.c
+++ b/src/gmio_core/internal/string_parse.c
@@ -17,7 +17,7 @@
 
 #include "helper_stream.h"
 #include "string_utils.h"
-/*#define GMIO_USE_FAST_ATOF*/
+#define GMIO_USE_FAST_ATOF
 #ifdef GMIO_USE_FAST_ATOF
 #  include "fast_atof.h"
 #endif