diff --git a/sysoptions.h b/sysoptions.h
index 5b701ec..385914a 100644
--- a/sysoptions.h
+++ b/sysoptions.h
@@ -380,9 +380,11 @@
 #endif
 
 /* Fuzzing expects all key types to be enabled */
+#if DROPBEAR_FUZZ
 #if defined(DROPBEAR_DSS)
 #undef DROPBEAR_DSS
 #endif
 #define DROPBEAR_DSS 1
+#endif
 
 /* no include guard for this file */