diff --git a/internal.h b/internal.h
index bfbd90bc5e..fec6d3c82f 100644
--- a/internal.h
+++ b/internal.h
@@ -2104,7 +2104,7 @@ VALUE rb_imemo_new(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0)
 #endif
 
 /* random.c */
-int fill_random_bytes(void *, size_t, int);
+int ruby_fill_random_bytes(void *, size_t, int);
 
 RUBY_SYMBOL_EXPORT_END
 
diff --git a/random.c b/random.c
index d8cfd38016..fbcaccaedb 100644
--- a/random.c
+++ b/random.c
@@ -574,13 +574,15 @@ fill_random_bytes_syscall(void *seed, size_t size, int need_secure)
 #endif
 
 int
-fill_random_bytes(void *seed, size_t size, int need_secure)
+ruby_fill_random_bytes(void *seed, size_t size, int need_secure)
 {
     int ret = fill_random_bytes_syscall(seed, size, need_secure);
     if (ret == 0) return ret;
     return fill_random_bytes_urandom(seed, size);
 }
 
+#define fill_random_bytes ruby_fill_random_bytes
+
 static void
 fill_random_seed(uint32_t *seed, size_t cnt)
 {
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 0374744756..84fd3aeb01 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -3913,7 +3913,7 @@ void
 Init_vm_stack_canary(void)
 {
     /* This has to be called _after_ our PRNG is properly set up. */
-    int n = fill_random_bytes(&vm_stack_canary, sizeof vm_stack_canary, false);
+    int n = ruby_fill_random_bytes(&vm_stack_canary, sizeof vm_stack_canary, false);
 
     VM_ASSERT(n == 0);
 }