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-rw-r--r--ext/openssl/ossl.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/openssl/ossl.h b/ext/openssl/ossl.h
index f8023bc..88e4506 100644
--- a/ext/openssl/ossl.h
+++ b/ext/openssl/ossl.h
@@ -30,6 +30,7 @@ extern "C" {
#endif
#include <ruby.h>
#include <ruby/io.h>
+#include <ruby/thread.h>
/*
* Check the OpenSSL version