diff --git a/STM32F1/cores/maple/itoa.c b/STM32F1/cores/maple/itoa.c
index ee74f82..33efd14 100644
--- a/STM32F1/cores/maple/itoa.c
+++ b/STM32F1/cores/maple/itoa.c
@@ -124,7 +124,7 @@ extern char* ltoa( long value, char *string, int radix )
    (__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 )
+extern char* utoa( unsigned int 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 b88204c..9997b65 100644
--- a/STM32F1/cores/maple/itoa.h
+++ b/STM32F1/cores/maple/itoa.h
@@ -35,7 +35,7 @@ extern char* ltoa( long value, char *string, int radix ) ;
    (__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 ) ;
+extern char* utoa( unsigned int 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 ee74f82..33efd14 100644
--- a/STM32F4/cores/maple/itoa.c
+++ b/STM32F4/cores/maple/itoa.c
@@ -124,7 +124,7 @@ extern char* ltoa( long value, char *string, int radix )
    (__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 )
+extern char* utoa( unsigned int 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 a6e893d..a317e82 100644
--- a/STM32F4/cores/maple/itoa.h
+++ b/STM32F4/cores/maple/itoa.h
@@ -35,7 +35,7 @@ extern char* ltoa( long value, char *string, int radix ) ;
    (__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 ) ;
+extern char* utoa( unsigned int value, char *string, int radix ) ;
 #endif
 extern char* ultoa( unsigned long value, char *string, int radix ) ;
 #endif /* 0 */