diff --git a/Include/floatobject.h b/Include/floatobject.h
index be1a80c..85537f1 100644
--- a/Include/floatobject.h
+++ b/Include/floatobject.h
@@ -86,6 +86,10 @@
 PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);
 PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);
 
+/* Used to get the important decimal digits of a double */
+PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum);
+PyAPI_FUNC(void) _PyFloat_DigitsInit(void);
+
 /* The unpack routines read 4 or 8 bytes, starting at p.  le is a bool
  * argument, true if the string is in little-endian format (exponent
  * last, at p+3 or p+7), false if big-endian (exponent first, at p).