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-rw-r--r--src/nbdebug.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nbdebug.c b/src/nbdebug.c
index 43bee8d8fd..c79081bea7 100644
--- a/src/nbdebug.c
+++ b/src/nbdebug.c
@@ -32,7 +32,7 @@
FILE *nb_debug = NULL;
u_int nb_dlevel = 0; // nb_debug verbosity level
-void nbdb(char *, ...);
+void nbdb(char *, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);
static int lookup(char *);
#ifdef USE_NB_ERRORHANDLER