diff --git a/include/curl/curl.h b/include/curl/curl.h
index 25b3836b4e..91e11f62d1 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -2318,30 +2318,26 @@ enum CURL_NETRC_OPTION {
   CURL_NETRC_LAST
 };
 
-enum {
-  CURL_SSLVERSION_DEFAULT,
-  CURL_SSLVERSION_TLSv1, /* TLS 1.x */
-  CURL_SSLVERSION_SSLv2,
-  CURL_SSLVERSION_SSLv3,
-  CURL_SSLVERSION_TLSv1_0,
-  CURL_SSLVERSION_TLSv1_1,
-  CURL_SSLVERSION_TLSv1_2,
-  CURL_SSLVERSION_TLSv1_3,
+#define CURL_SSLVERSION_DEFAULT 0
+#define CURL_SSLVERSION_TLSv1   1 /* TLS 1.x */
+#define CURL_SSLVERSION_SSLv2   2
+#define CURL_SSLVERSION_SSLv3   3
+#define CURL_SSLVERSION_TLSv1_0 4
+#define CURL_SSLVERSION_TLSv1_1 5
+#define CURL_SSLVERSION_TLSv1_2 6
+#define CURL_SSLVERSION_TLSv1_3 7
 
-  CURL_SSLVERSION_LAST /* never use, keep last */
-};
+#define CURL_SSLVERSION_LAST 8 /* never use, keep last */
 
-enum {
-  CURL_SSLVERSION_MAX_NONE =     0,
-  CURL_SSLVERSION_MAX_DEFAULT =  (CURL_SSLVERSION_TLSv1   << 16),
-  CURL_SSLVERSION_MAX_TLSv1_0 =  (CURL_SSLVERSION_TLSv1_0 << 16),
-  CURL_SSLVERSION_MAX_TLSv1_1 =  (CURL_SSLVERSION_TLSv1_1 << 16),
-  CURL_SSLVERSION_MAX_TLSv1_2 =  (CURL_SSLVERSION_TLSv1_2 << 16),
-  CURL_SSLVERSION_MAX_TLSv1_3 =  (CURL_SSLVERSION_TLSv1_3 << 16),
+#define CURL_SSLVERSION_MAX_NONE 0
+#define CURL_SSLVERSION_MAX_DEFAULT (CURL_SSLVERSION_TLSv1   << 16)
+#define CURL_SSLVERSION_MAX_TLSv1_0 (CURL_SSLVERSION_TLSv1_0 << 16)
+#define CURL_SSLVERSION_MAX_TLSv1_1 (CURL_SSLVERSION_TLSv1_1 << 16)
+#define CURL_SSLVERSION_MAX_TLSv1_2 (CURL_SSLVERSION_TLSv1_2 << 16)
+#define CURL_SSLVERSION_MAX_TLSv1_3 (CURL_SSLVERSION_TLSv1_3 << 16)
 
   /* never use, keep last */
-  CURL_SSLVERSION_MAX_LAST =     (CURL_SSLVERSION_LAST    << 16)
-};
+#define CURL_SSLVERSION_MAX_LAST    (CURL_SSLVERSION_LAST    << 16)
 
 enum CURL_TLSAUTH {
   CURL_TLSAUTH_NONE,