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-rw-r--r--math/bits/cmathcalls.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/math/bits/cmathcalls.h b/math/bits/cmathcalls.h
index 57a2582d70..3a46822cb5 100644
--- a/math/bits/cmathcalls.h
+++ b/math/bits/cmathcalls.h
@@ -151,7 +151,7 @@ __MATH_PRECNAME(creal) (_Mdouble_complex_ __z) __THROW
 extern __inline _Mdouble_complex_
 __MATH_PRECNAME(conj) (_Mdouble_complex_ __z) __THROW
 {
-  return ~__z;
+  return __extension__ ~__z;
 }
 
 #endif