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-rw-r--r--src/prog-fprintf.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/prog-fprintf.h b/src/prog-fprintf.h
index d26334c8f..eb0f185e6 100644
--- a/src/prog-fprintf.h
+++ b/src/prog-fprintf.h
@@ -20,6 +20,6 @@
# include <stdio.h>
extern void prog_fprintf (FILE *fp, char const *fmt, ...)
- _GL_ATTRIBUTE_FORMAT ((__printf__, 2, 3));
+ _GL_ATTRIBUTE_FORMAT ((__printf__, 2, 3)) _GL_ATTRIBUTE_NONNULL ((1, 2));;
#endif