diff --git a/include/common/standard.h b/include/common/standard.h
index ce3c6b85b..4dd622ac4 100644
--- a/include/common/standard.h
+++ b/include/common/standard.h
@@ -55,7 +55,7 @@ extern int strlcpy2(char *dst, const char *src, int size);
  * the ascii representation for number 'n' in decimal.
  */
 extern char itoa_str[][171];
-extern const char *ultoa_r(unsigned long n, char *buffer, int size);
+extern char *ultoa_r(unsigned long n, char *buffer, int size);
 extern const char *ulltoh_r(unsigned long long n, char *buffer, int size);
 static inline const char *ultoa(unsigned long n)
 {
diff --git a/src/standard.c b/src/standard.c
index aab318bb3..6ae4dd784 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -57,7 +57,7 @@ int strlcpy2(char *dst, const char *src, int size)
  * This function simply returns a locally allocated string containing
  * the ascii representation for number 'n' in decimal.
  */
-const char *ultoa_r(unsigned long n, char *buffer, int size)
+char *ultoa_r(unsigned long n, char *buffer, int size)
 {
 	char *pos;