diff --git a/STM32F1/cores/maple/itoa.c b/STM32F1/cores/maple/itoa.c
index fc35766..ee74f82 100644
--- a/STM32F1/cores/maple/itoa.c
+++ b/STM32F1/cores/maple/itoa.c
@@ -120,8 +120,12 @@ extern char* ltoa( long value, char *string, int radix )
 
   return string;
 }
-
+#if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 9 || \
+   (__GNUC_MINOR__ == 9 && __GNUC_PATCHLEVEL__ > 2)))
+extern char* utoa( unsigned value, char *string, int radix )
+#else
 extern char* utoa( unsigned long value, char *string, int radix )
+#endif
 {
   return ultoa( value, string, radix ) ;
 }
diff --git a/STM32F1/cores/maple/itoa.h b/STM32F1/cores/maple/itoa.h
index 59af109..b88204c 100644
--- a/STM32F1/cores/maple/itoa.h
+++ b/STM32F1/cores/maple/itoa.h
@@ -31,7 +31,12 @@ extern void itoa( int n, char s[] ) ;
 
 extern char* itoa( int value, char *string, int radix ) ;
 extern char* ltoa( long value, char *string, int radix ) ;
+#if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 9 || \
+   (__GNUC_MINOR__ == 9 && __GNUC_PATCHLEVEL__ > 2)))
+extern char* utoa( unsigned value, char *string, int radix ) ;
+#else
 extern char* utoa( unsigned long value, char *string, int radix ) ;
+#endif
 extern char* ultoa( unsigned long value, char *string, int radix ) ;
 #endif /* 0 */
 
diff --git a/STM32F4/cores/maple/itoa.c b/STM32F4/cores/maple/itoa.c
index fc35766..ee74f82 100644
--- a/STM32F4/cores/maple/itoa.c
+++ b/STM32F4/cores/maple/itoa.c
@@ -120,8 +120,12 @@ extern char* ltoa( long value, char *string, int radix )
 
   return string;
 }
-
+#if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 9 || \
+   (__GNUC_MINOR__ == 9 && __GNUC_PATCHLEVEL__ > 2)))
+extern char* utoa( unsigned value, char *string, int radix )
+#else
 extern char* utoa( unsigned long value, char *string, int radix )
+#endif
 {
   return ultoa( value, string, radix ) ;
 }
diff --git a/STM32F4/cores/maple/itoa.h b/STM32F4/cores/maple/itoa.h
index 59af109..b88204c 100644
--- a/STM32F4/cores/maple/itoa.h
+++ b/STM32F4/cores/maple/itoa.h
@@ -31,7 +31,12 @@ extern void itoa( int n, char s[] ) ;
 
 extern char* itoa( int value, char *string, int radix ) ;
 extern char* ltoa( long value, char *string, int radix ) ;
+#if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 9 || \
+   (__GNUC_MINOR__ == 9 && __GNUC_PATCHLEVEL__ > 2)))
+extern char* utoa( unsigned value, char *string, int radix ) ;
+#else
 extern char* utoa( unsigned long value, char *string, int radix ) ;
+#endif
 extern char* ultoa( unsigned long value, char *string, int radix ) ;
 #endif /* 0 */