diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index b2af5ffa3..e81a73ea1 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jul 27 10:46:01 2000  Christopher Faylor <cgf@cygnus.com>
+
+	* libc/include/math.h: Use appropriate dll import linkage for
+	__infinity under Cygwin.
+
 2000-07-13  DJ Delorie  <dj@cygnus.com>
 
 	* libc/stdio/vfprintf.c: pad 0.0 correctly with %e
diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h
index d3f2e99ae..cd03945c9 100644
--- a/newlib/libc/include/math.h
+++ b/newlib/libc/include/math.h
@@ -21,7 +21,11 @@ union __dmath
   double d;
 };
 
+#if !defined(__CYGWIN__) || defined(__INSIDE_CYGWIN__) || defined(_COMPILING_NEWLIB)
 extern const union __dmath __infinity;
+#else
+extern __declspec(dllimport) const union __dmath __infinity;
+#endif
 
 #define HUGE_VAL (__infinity.d)