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-rw-r--r--src/common/strlib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/common/strlib.c b/src/common/strlib.c
index c0cc5b4ec..648a06d18 100644
--- a/src/common/strlib.c
+++ b/src/common/strlib.c
@@ -979,7 +979,7 @@ int StringBuf_Vprintf(StringBuf* self, const char* fmt, va_list ap)
/* Try to print in the allocated space. */
size = self->max_ - (self->ptr_ - self->buf_);
va_copy(apcopy, ap);
- n = vsnprintf(self->ptr_, size, fmt, ap);
+ n = vsnprintf(self->ptr_, size, fmt, apcopy);
va_end(apcopy);
/* If that worked, return the length. */
if( n > -1 && n < size )