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-rw-r--r--ext/openssl/ossl.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/openssl/ossl.h b/ext/openssl/ossl.h
index a4bc661eb1..33b0373c53 100644
--- a/ext/openssl/ossl.h
+++ b/ext/openssl/ossl.h
@@ -106,7 +106,7 @@ extern VALUE eOSSLError;
/*
* String to HEXString conversion
*/
-int string2hex(char *, int, char **, int *);
+int string2hex(const unsigned char *, int, char **, int *);
/*
* Data Conversion