diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index cbc654e..3e6366c 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -375,6 +375,9 @@
     " acceptable ciphersuite names:\n"
 
 
+#define ALPN_LIST_SIZE  10
+#define CURVE_LIST_SIZE 20
+
 #define PUT_UINT64_BE(out_be,in_le,i)                                   \
 {                                                                       \
     (out_be)[(i) + 0] = (unsigned char)( ( (in_le) >> 56 ) & 0xFF );    \
@@ -886,11 +889,11 @@
     sni_entry *sni_info = NULL;
 #endif
 #if defined(MBEDTLS_ECP_C)
-    mbedtls_ecp_group_id     curve_list[20];
+    mbedtls_ecp_group_id curve_list[CURVE_LIST_SIZE];
     const mbedtls_ecp_curve_info * curve_cur;
 #endif
 #if defined(MBEDTLS_SSL_ALPN)
-    const char *alpn_list[10];
+    const char *alpn_list[ALPN_LIST_SIZE];
 #endif
 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
     unsigned char alloc_buf[100000];
@@ -1453,8 +1456,7 @@
         else if( strcmp( p, "default" ) != 0 )
         {
             /* Leave room for a final NULL in curve list */
-            while( i < (int) ( sizeof( curve_list ) / sizeof( *curve_list ) ) - 1
-                   && *p != '\0' )
+            while( i < CURVE_LIST_SIZE - 1 && *p != '\0' )
             {
                 q = p;
 
@@ -1485,11 +1487,10 @@
 
             mbedtls_printf("Number of curves: %d\n", i );
 
-            if( i == (int) ( sizeof( curve_list ) / sizeof( *curve_list ) ) - 1
-                && *p != '\0' )
+            if( i == CURVE_LIST_SIZE - 1 && *p != '\0' )
             {
-                mbedtls_printf( "curves list too long, maximum %zu",
-                                (size_t) ( sizeof( curve_list ) / sizeof( *curve_list ) - 1 ) );
+                mbedtls_printf( "curves list too long, maximum %d",
+                                CURVE_LIST_SIZE - 1  );
                 goto exit;
             }
 
@@ -1505,7 +1506,7 @@
         i = 0;
 
         /* Leave room for a final NULL in alpn_list */
-        while( i < (int) sizeof alpn_list - 1 && *p != '\0' )
+        while( i < ALPN_LIST_SIZE - 1 && *p != '\0' )
         {
             alpn_list[i++] = p;