1 files changed, 2 insertions, 1 deletions

diff --git a/crypto/compat/getprogname_windows.c b/crypto/compat/getprogname_windows.c
index eb04ec0..9de3cab 100644
--- a/crypto/compat/getprogname_windows.c
+++ b/crypto/compat/getprogname_windows.c
@@ -7,7 +7,8 @@ getprogname(void)
 {
         static char progname[MAX_PATH + 1];
         DWORD length = GetModuleFileName(NULL, progname, sizeof (progname) - 1);
-        if (length < 0)
+        if (length == 0)
                 return "?";
+        progname[length] = '\0';
         return progname;
 }