diff --git a/src/config b/src/config
index 2e03447..32450e7 100644
--- a/src/config
+++ b/src/config
@@ -1,4 +1,4 @@
 CONFIG_VERSION="0.1.3"
 #FWVER=00010300
-CONFIG_FWVER=66304
+CONFIG_FWVER=0x00010300
 CONFIG_MCU_FOSC=12000000
diff --git a/src/utils/genhdr.c b/src/utils/genhdr.c
index 491450c..19484c5 100644
--- a/src/utils/genhdr.c
+++ b/src/utils/genhdr.c
@@ -73,7 +73,7 @@ int main(int argc, char **argv) {
     return 1;
   }
   char *remaining = NULL;
-  uint32_t version = (uint32_t)strtol(argv[3], &remaining, 10);
+  uint32_t version = (uint32_t)strtol(argv[3], &remaining, 0);
   if(*remaining) {
     printf("could not parse version number (remaining portion: %s)\n", remaining);
     fclose(f);