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-rw-r--r--bits/byteswap-16.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/bits/byteswap-16.h b/bits/byteswap-16.h
index 078dd0e17a..6cc1d30932 100644
--- a/bits/byteswap-16.h
+++ b/bits/byteswap-16.h
@@ -23,7 +23,8 @@
 #ifdef __GNUC__
 # define __bswap_16(x) \
     (__extension__							      \
-     ({ unsigned short int __bsx = (x); __bswap_constant_16 (__bsx); }))
+     ({ unsigned short int __bsx = (unsigned short int) (x);		      \
+       __bswap_constant_16 (__bsx); }))
 #else
 static __inline unsigned short int
 __bswap_16 (unsigned short int __bsx)