1 files changed, 1 insertions, 1 deletions

diff --git a/lib/fpending.h b/lib/fpending.h
index 4eca3f18e17..30d67fcd74f 100644
--- a/lib/fpending.h
+++ b/lib/fpending.h
@@ -25,5 +25,5 @@
 #endif
 
 #ifndef __fpending
-size_t __fpending (FILE *);
+size_t __fpending (FILE *) _GL_ATTRIBUTE_PURE;
 #endif