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-rw-r--r--math/bits/mathcalls.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index 64da6276f6..4f22abf74f 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -1,5 +1,5 @@
 /* Prototype declarations for math functions; helper file for <math.h>.
-   Copyright (C) 1996-2002, 2003, 2006 Free Software Foundation, Inc.
+   Copyright (C) 1996-2002, 2003, 2006, 2011 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -113,7 +113,8 @@ __MATHCALL (log,, (_Mdouble_ __x));
 __MATHCALL (log10,, (_Mdouble_ __x));
 
 /* Break VALUE into integral and fractional parts.  */
-__MATHCALL (modf,, (_Mdouble_ __x, _Mdouble_ *__iptr));
+__MATHCALL (modf,, (_Mdouble_ __x, _Mdouble_ *__iptr))
+     __attribute__ ((__nonnull__ (2)));
 _Mdouble_END_NAMESPACE
 
 #ifdef __USE_GNU