diff --git a/LibAPRS/LibAPRS.h b/LibAPRS/LibAPRS.h
index 4e1849d..d0a1e9c 100644
--- a/LibAPRS/LibAPRS.h
+++ b/LibAPRS/LibAPRS.h
@@ -20,7 +20,7 @@ void APRS_setPath2(char *call, int ssid);
 void APRS_setPreamble(unsigned long pre);
 void APRS_setTail(unsigned long tail);
 void APRS_useAlternateSymbolTable(bool use);
-void APRS_setDataTypeID(char flag);//va7ta update
+void APRS_setDataTypeID(uint8_t flag);//va7ta update
 
 void APRS_setSymbol(char sym);