1diff --git a/teensy3/avr_functions.h b/teensy3/avr_functions.h
2index a03ee53..55ac283 100644
3--- a/teensy3/avr_functions.h
4+++ b/teensy3/avr_functions.h
5@@ -97,12 +97,12 @@ char * ltoa(long val, char *buf, int radix);
6 char * ulltoa(unsigned long long val, char *buf, int radix);
7 char * lltoa(long long val, char *buf, int radix);
8
9-/* #if defined(__STRICT_ANSI__) || (defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2))
10+#if defined(__STRICT_ANSI__) || (defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2))
11 static inline char * utoa(unsigned int val, char *buf, int radix) __attribute__((always_inline, unused));
12 static inline char * utoa(unsigned int val, char *buf, int radix) { return ultoa(val, buf, radix); }
13 static inline char * itoa(int val, char *buf, int radix) __attribute__((always_inline, unused));
14 static inline char * itoa(int val, char *buf, int radix) { return ltoa(val, buf, radix); }
15-#endif */
16+#endif
17
18 char * dtostrf(float val, int width, unsigned int precision, char *buf);
19
20diff --git a/teensy4/avr_functions.h b/teensy4/avr_functions.h
21index 6d692ff..4524614 100644
22--- a/teensy4/avr_functions.h
23+++ b/teensy4/avr_functions.h
24@@ -99,12 +99,12 @@ char * ltoa(long val, char *buf, int radix);
25 char * ulltoa(unsigned long long val, char *buf, int radix);
26 char * lltoa(long long val, char *buf, int radix);
27
28-/* #if defined(__STRICT_ANSI__) || (defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2))
29+#if defined(__STRICT_ANSI__) || (defined(_NEWLIB_VERSION) && (__NEWLIB__ < 2 || __NEWLIB__ == 2 && __NEWLIB_MINOR__ < 2))
30 static inline char * utoa(unsigned int val, char *buf, int radix) __attribute__((always_inline, unused));
31 static inline char * utoa(unsigned int val, char *buf, int radix) { return ultoa(val, buf, radix); }
32 static inline char * itoa(int val, char *buf, int radix) __attribute__((always_inline, unused));
33 static inline char * itoa(int val, char *buf, int radix) { return ltoa(val, buf, radix); }
34-#endif */
35+#endif
36
37 char * dtostrf(float val, int width, unsigned int precision, char *buf);
38
39