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-rw-r--r--src/util/u_string.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/util/u_string.h b/src/util/u_string.h
index ce454308d7b..374c00e0bcb 100644
--- a/src/util/u_string.h
+++ b/src/util/u_string.h
@@ -119,7 +119,7 @@ util_vasprintf(char **ret, const char *format, va_list ap)
/* Compute length of output string first */
va_copy(ap_copy, ap);
- int r = util_vsnprintf(NULL, 0, format, ap);
+ int r = util_vsnprintf(NULL, 0, format, ap_copy);
va_end(ap_copy);
if (r < 0)