diff --git a/plugins/sudoers/regress/iolog_path/check_iolog_path.c b/plugins/sudoers/regress/iolog_path/check_iolog_path.c
index cef22ffab..036d86a71 100644
--- a/plugins/sudoers/regress/iolog_path/check_iolog_path.c
+++ b/plugins/sudoers/regress/iolog_path/check_iolog_path.c
@@ -105,6 +105,10 @@ main(int argc, char *argv[])
     int errors = 0;
     int tests = 0;
 
+#if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
+    setprogname(argc > 0 ? argv[0] : "check_iolog_path");
+#endif
+
     if (argc != 2)
 	usage();
 
diff --git a/plugins/sudoers/regress/logging/check_wrap.c b/plugins/sudoers/regress/logging/check_wrap.c
index 2b904d929..33d7b9ddd 100644
--- a/plugins/sudoers/regress/logging/check_wrap.c
+++ b/plugins/sudoers/regress/logging/check_wrap.c
@@ -56,6 +56,10 @@ main(int argc, char *argv[])
     char *cp, *dash, *line, lines[2][2048];
     int which = 0;
 
+#if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
+    setprogname(argc > 0 ? argv[0] : "check_wrap");
+#endif
+
     if (argc != 2)
 	usage();
 
diff --git a/plugins/sudoers/regress/parser/check_addr.c b/plugins/sudoers/regress/parser/check_addr.c
index 65f7099bc..b96dec63b 100644
--- a/plugins/sudoers/regress/parser/check_addr.c
+++ b/plugins/sudoers/regress/parser/check_addr.c
@@ -92,6 +92,10 @@ main(int argc, char *argv[])
     size_t len;
     FILE *fp;
 
+#if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
+    setprogname(argc > 0 ? argv[0] : "check_addr");
+#endif
+
     if (argc != 2)
 	usage();