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diff --git a/test-environ.c b/test-environ.c
index 46a2eab..8afecb7 100644
--- a/test-environ.c
+++ b/test-environ.c
@@ -22,6 +22,13 @@
#include <string.h>
+/* environ is the exported symbol referencing the internal
+ __cygwin_environ variable on cygwin64:
+ <https://cygwin.com/ml/cygwin/2013-06/msg00228.html>. */
+#if defined __CYGWIN__ && defined __x86_64__
+extern DLL_VARIABLE char **environ;
+#endif
+
int
main ()
{
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