diff --git a/library/rsa.c b/library/rsa.c
index 98d7770..75e7a9a 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -1408,6 +1408,7 @@
 
 static int myrand( void *rng_state, unsigned char *output, size_t len )
 {
+#if !defined(__OpenBSD__)
     size_t i;
 
     if( rng_state != NULL )
@@ -1415,6 +1416,12 @@
 
     for( i = 0; i < len; ++i )
         output[i] = rand();
+#else
+    if( rng_state != NULL )
+        rng_state = NULL;
+
+    arc4random_buf( output, len );
+#endif /* !OpenBSD */
 
     return( 0 );
 }