--- /dev/null
+++ b/cbits-wasi/init.c
@@ -0,0 +1,8 @@
+#include <stdint.h>
+#include <sys/random.h>
+
+uint64_t splitmix_init() {
+  uint64_t result;
+  int r = getentropy(&result, sizeof(uint64_t));
+  return r == 0 ? result : 0xfeed1000;
+}
--- a/splitmix.cabal
+++ b/splitmix.cabal
@@ -80,7 +80,10 @@ library
         frameworks: Security

       else
-        c-sources: cbits-unix/init.c
+        if arch(wasm32)
+          c-sources: cbits-wasi/init.c
+        else
+          c-sources: cbits-unix/init.c

     else
       cpp-options:   -DSPLITMIX_INIT_COMPAT=1