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-rw-r--r--src/lib/util/astring.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lib/util/astring.h b/src/lib/util/astring.h
index 3d80216383c..36ba50acb1d 100644
--- a/src/lib/util/astring.h
+++ b/src/lib/util/astring.h
@@ -70,7 +70,7 @@ astring *astring_inssubstr(astring *dst, int insbefore, const astring *src, int
astring *astring_substr(astring *str, int start, int count);
/* formatted printf to an astring */
-int astring_printf(astring *dst, const char *format, ...);
+int astring_printf(astring *dst, const char *format, ...) ATTR_PRINTF(2,3);