--- a/src/lj_prng.c
+++ b/src/lj_prng.c
@@ -129,20 +129,22 @@
 #define LJ_TARGET_HAS_GETENTROPY	1
 #endif
 
+/* For the /dev/urandom fallback. */
+#include <fcntl.h>
+#include <unistd.h>
+
 #if LJ_TARGET_HAS_GETENTROPY
+#if !defined(__FreeBSD__)
 extern int getentropy(void *buf, size_t len)
 #ifdef __ELF__
   __attribute__((weak))
 #endif
 ;
 #endif
+#endif
 
 #endif
 
-/* For the /dev/urandom fallback. */
-#include <fcntl.h>
-#include <unistd.h>
-
 #endif
 
 #if LUAJIT_SECURITY_PRNG == 0