diff --git a/programs/ssl/ssl_context_info.c b/programs/ssl/ssl_context_info.c
index a204d9e..7ac01d6 100644
--- a/programs/ssl/ssl_context_info.c
+++ b/programs/ssl/ssl_context_info.c
@@ -222,7 +222,13 @@
                 error_exit();
             }
 
-            if( ( b64_file = fopen( argv[i], "r" ) ) == NULL )
+            if( NULL != b64_file )
+            {
+                printf_err( "Cannot specify more than one file with -f\n" );
+                error_exit( );
+            }
+
+            if( ( b64_file = fopen( argv[i], "r" )) == NULL )
             {
                 printf_err( "Cannot find file \"%s\"\n", argv[i] );
                 error_exit();