diff --git a/crypto/ocsp/ocsp.h b/crypto/ocsp/ocsp.h
index 2ad7cf2d26c7c6f970c17cf7db37e51f948a3559..7bf3404b501749458cb40e17abcc38b9babc801b 100644
--- a/crypto/ocsp/ocsp.h
+++ b/crypto/ocsp/ocsp.h
@@ -464,7 +464,7 @@ int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
 
 int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, X509_STORE *store, unsigned long flags);
 
-int OCSP_parse_url(char *url, char **phost, char **pport, char **ppath, int *pssl);
+int OCSP_parse_url(const char *url, char **phost, char **pport, char **ppath, int *pssl);
 
 int OCSP_id_issuer_cmp(OCSP_CERTID *a, OCSP_CERTID *b);
 int OCSP_id_cmp(OCSP_CERTID *a, OCSP_CERTID *b);
diff --git a/crypto/ocsp/ocsp_lib.c b/crypto/ocsp/ocsp_lib.c
index a94dc838eecbfc84ecae6a14c9acb88bdc9234ec..2678e222dd14eaf18506af1018732a6985aca3e7 100644
--- a/crypto/ocsp/ocsp_lib.c
+++ b/crypto/ocsp/ocsp_lib.c
@@ -165,7 +165,7 @@ int OCSP_id_cmp(OCSP_CERTID *a, OCSP_CERTID *b)
  * it is SSL.
  */
 
-int OCSP_parse_url(char *url, char **phost, char **pport, char **ppath, int *pssl)
+int OCSP_parse_url(const char *url, char **phost, char **pport, char **ppath, int *pssl)
 	{
 	char *p, *buf;