diff --git a/src/microhttpd/postprocessor.c b/src/microhttpd/postprocessor.c
index 99074215..c00605c7 100644
--- a/src/microhttpd/postprocessor.c
+++ b/src/microhttpd/postprocessor.c
@@ -83,7 +83,7 @@ MHD_create_post_processor (struct MHD_Connection *connection,
       return NULL; /* failed to determine boundary */
     boundary += MHD_STATICSTR_LEN_ ("boundary=");
     blen = strlen (boundary);
-    if ( (blen == 0) ||
+    if ( (blen < 2) ||
          (blen * 2 + 2 > buffer_size) )
       return NULL;              /* (will be) out of memory or invalid boundary */
     if ( (boundary[0] == '"') &&
-- 
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