diff --git a/src/helper/log.c b/src/helper/log.c
index 3d4f0389d..694e8a8b2 100644
--- a/src/helper/log.c
+++ b/src/helper/log.c
@@ -288,6 +288,9 @@ char *alloc_printf(const char *fmt, va_list ap)
 
 		int ret;
 		ret = vsnprintf(string, size, fmt, ap_copy);
+		
+		va_end(ap_copy);
+		
 		/* NB! The result of the vsnprintf() might be an *EMPTY* string! */
 		if ((ret >= 0) && ((ret + 1) < size))
 			break;