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-rw-r--r--lib/curlx/dynbuf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/curlx/dynbuf.c b/lib/curlx/dynbuf.c
index cd4f4635a..447203e42 100644
--- a/lib/curlx/dynbuf.c
+++ b/lib/curlx/dynbuf.c
@@ -231,6 +231,7 @@ CURLcode curlx_dyn_addf(struct dynbuf *s, const char *fmt, ...)
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
+ DEBUGASSERT(strcmp(fmt, "%s")); /* use curlx_dyn_add instead */
va_start(ap, fmt);
result = curlx_dyn_vaddf(s, fmt, ap);
va_end(ap);