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-rw-r--r--ext/socket/extconf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index 00821ccb01..da498639ad 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -268,7 +268,7 @@ end
have_header("sys/un.h")
have_header("sys/uio.h")
-$distcleanfiles = "constants.h"
+$distcleanfiles << "constants.h"
if have_func(test_func)
have_func("hsterror")