diff --git a/newlib/libc/include/string.h b/newlib/libc/include/string.h
index 29e0d4476..7833aa156 100644
--- a/newlib/libc/include/string.h
+++ b/newlib/libc/include/string.h
@@ -141,16 +141,16 @@ int	 _EXFUN(strverscmp,(const char *, const char *));
 
 #if __GNU_VISIBLE && defined(__GNUC__)
 #define strdupa(__s) \
-	(__extension__ ({const char *__in = (__s); \
-			 size_t __len = strlen (__in) + 1; \
-			 char * __out = (char *) __builtin_alloca (__len); \
-			 (char *) memcpy (__out, __in, __len);}))
+	(__extension__ ({const char *__sin = (__s); \
+			 size_t __len = strlen (__sin) + 1; \
+			 char * __sout = (char *) __builtin_alloca (__len); \
+			 (char *) memcpy (__sout, __sin, __len);}))
 #define strndupa(__s, __n) \
-	(__extension__ ({const char *__in = (__s); \
-			 size_t __len = strnlen (__in, (__n)) + 1; \
-			 char *__out = (char *) __builtin_alloca (__len); \
-			 __out[__len-1] = '\0'; \
-			 (char *) memcpy (__out, __in, __len-1);}))
+	(__extension__ ({const char *__sin = (__s); \
+			 size_t __len = strnlen (__sin, (__n)) + 1; \
+			 char *__sout = (char *) __builtin_alloca (__len); \
+			 __sout[__len-1] = '\0'; \
+			 (char *) memcpy (__sout, __sin, __len-1);}))
 #endif /* __GNU_VISIBLE && __GNUC__ */
 
 /* There are two common basename variants.  If you do NOT #include <libgen.h>
diff --git a/winsup/cygwin/include/sys/wait.h b/winsup/cygwin/include/sys/wait.h
index 69e1b9d9b..dc8945843 100644
--- a/winsup/cygwin/include/sys/wait.h
+++ b/winsup/cygwin/include/sys/wait.h
@@ -88,7 +88,7 @@ inline int __wait_status_to_int (const union wait & __status)
 #else /* !__cplusplus */
 
 #define __wait_status_to_int(__status)  (__extension__ \
-  (((union { __typeof(__status) __in; int __out; }) { .__in = (__status) }).__out))
+  (((union { __typeof(__status) __sin; int __sout; }) { .__sin = (__status) }).__sout))
 
 #endif /* __cplusplus */