diff --git a/armsrc/appmain.c b/armsrc/appmain.c
index 2f6697429..4a9ac2c9f 100644
--- a/armsrc/appmain.c
+++ b/armsrc/appmain.c
@@ -246,7 +246,7 @@ void ReadMem(int addr) {
 /* osimage version information is linked in */
 extern struct version_information version_information;
 /* bootrom version information is pointed to from _bootphase1_version_pointer */
-extern char *_bootphase1_version_pointer, _flash_start, _flash_end, _bootrom_start, _bootrom_end, __data_src_start__;
+extern char *_bootphase1_version_pointer, _flash_start, _flash_end, __data_src_start__;
 void SendVersion(void) {
     char temp[PM3_CMD_DATA_SIZE - 12]; /* Limited data payload in USB packets */
     char VersionString[PM3_CMD_DATA_SIZE - 12] = { '\0' };