diff --git a/README b/README
index f7956dd..d23028e 100644
--- a/README
+++ b/README
@@ -24,6 +24,7 @@ v0.25
 - Fix memory leaks (Thanks PartialVolume)
 - Check right pointer (Thanks PartialVolume)
 - Fix casting problem (Thanks PartialVolume)
+- Fix serial number
 
 v0.24
 - use include values for version 0.17
diff --git a/src/nwipe.c b/src/nwipe.c
index c31b956..0dec569 100644
--- a/src/nwipe.c
+++ b/src/nwipe.c
@@ -286,7 +286,7 @@ int main( int argc, char** argv )
                 */
 
                 /* Print serial number of device if it exists. */
-                if ( strlen(c2[i]->identity.serial_no) ) {
+		if ( strlen((const char*)c2[i]->identity.serial_no) ) {
                         nwipe_log( NWIPE_LOG_INFO, "Device %s has serial number %s", c2[i]->device_name, c2[i]->identity.serial_no);
                 }