diff --git a/src/uexbconv.c b/src/uexbconv.c
index fe3d3fa..ea48adc 100644
--- a/src/uexbconv.c
+++ b/src/uexbconv.c
@@ -97,7 +97,7 @@ main(int argc, char **argv)
 	switch (arg[1]) {
 	case 'v': swverb = 1; break;
 	default:
-	    fprintf(stderr, usage);
+	    fprintf(stderr, usage, argv[0]);
 	    exit(1);
 	}
     }
diff --git a/src/wfconv.c b/src/wfconv.c
index 98d41ed..c0b0196 100644
--- a/src/wfconv.c
+++ b/src/wfconv.c
@@ -84,7 +84,7 @@ main(int argc, char **argv)
     w10_t w;
 
     if (argc != 2 || strlen(typestr = argv[1]) != 3) {
-	fprintf(stderr, usage);
+	fprintf(stderr, "%s", usage);
 	exit(1);
     }
     if (typestr[0] != '-'