diff --git a/src/bin/zfs-tpm-list.cpp b/src/bin/zfs-tpm-list.cpp
index 6f7522d..acf8ced 100644
--- a/src/bin/zfs-tpm-list.cpp
+++ b/src/bin/zfs-tpm-list.cpp
@@ -96,7 +96,7 @@ int main(int argc, char ** argv) {
 				    break;
 			    case 'd':
 				    if(!parse_uint(optarg, maxdepth))
-					    return fprintf(stderr, "-d %s: %s\n", optarg, strerror(errno)), __LINE__;
+					    return fprintf(stderr, "%s: -d %s: %s\n", argv[0], optarg, strerror(errno)), __LINE__;
 				    break;
 			    case 'a':
 				    print_nontzpfms = true;