1 files changed, 5 insertions, 2 deletions
diff --git a/hugin.c b/hugin.c
index 33a9947..564d6be 100644
--- a/hugin.c
+++ b/hugin.c
@@ -403,8 +403,10 @@ int __debug(const char *func, const int line,
   va_list va;
   va_start(va, fmt);
 
+  va_list vacpy;
+  va_copy(vacpy, va);
   hdr_bufsz = scprintf(hdr_fmt, HDR_ARGS);
-  msg_bufsz = vscprintf(fmt, va);
+  msg_bufsz = vscprintf(fmt, vacpy);
   if(hdr_bufsz < 0 || msg_bufsz < 0) return 1; // Bad format?
 
   buf = (char*)malloc(hdr_bufsz + msg_bufsz + 1);
@@ -413,7 +415,8 @@ int __debug(const char *func, const int line,
   sz = sprintf(buf, hdr_fmt, HDR_ARGS);
   if(sz < 0) return 1; // Unknown error
 
-  sz = vsprintf(buf + sz, fmt, va);
+  va_copy(vacpy, va);
+  sz = vsprintf(buf + sz, fmt, vacpy);
   if(sz < 0) return 1; // Unknown error
 
   va_end(va);