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-rw-r--r--pkgs/stdenv/generic/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/pkgs/stdenv/generic/default.nix b/pkgs/stdenv/generic/default.nix
index 14da127b9e05..ce0fd3a1dc2c 100644
--- a/pkgs/stdenv/generic/default.nix
+++ b/pkgs/stdenv/generic/default.nix
@@ -127,7 +127,8 @@ let
              || system == "x86_64-kfreebsd-gnu";
       isSunOS = system == "i686-solaris"
              || system == "x86_64-solaris";
-      isCygwin = system == "i686-cygwin";
+      isCygwin = system == "i686-cygwin"
+              || system == "x86_64-cygwin";
       isFreeBSD = system == "i686-freebsd"
               || system == "x86_64-freebsd";
       isOpenBSD = system == "i686-openbsd"