diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5befba2..cf50de9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.10)
-project(fun VERSION 0.37.25 LANGUAGES C)
+project(fun VERSION 0.37.26 LANGUAGES C)
 
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_STANDARD_REQUIRED ON)
diff --git a/src/vm/os/random_number.c b/src/vm/os/random_number.c
index a84244d..adc81f1 100644
--- a/src/vm/os/random_number.c
+++ b/src/vm/os/random_number.c
@@ -27,6 +27,8 @@
 #elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
   #include <stdlib.h>
   #include <sys/random.h>
+  /* On some BSDs, arc4random_buf might be hidden by _POSIX_C_SOURCE. */
+  void arc4random_buf(void *, size_t);
 #elif defined(__unix__)
   #if __has_include(<sys/random.h>)
     #include <sys/random.h>