diff --git a/lib/otp/otp_locl.h b/lib/otp/otp_locl.h
index 2aa6b3152..18e342928 100644
--- a/lib/otp/otp_locl.h
+++ b/lib/otp/otp_locl.h
@@ -64,11 +64,10 @@
 #endif
 
 #include <roken.h>
-#include <protos.h>
 
 #include <otp.h>
 
-#include <xdbm.h>
+#include <ndbm.h>
 
 #define OTPKEYS "/.otpkeys"