diff --git a/src/include/janet.h b/src/include/janet.h
index b6de1287..ff6b26e0 100644
--- a/src/include/janet.h
+++ b/src/include/janet.h
@@ -1545,7 +1545,7 @@ JANET_API FILE *janet_dynfile(const char *name, FILE *def);
 JANET_API JanetAbstract janet_checkfile(Janet j);
 JANET_API FILE *janet_unwrapfile(Janet j, int32_t *flags);
 
-int janet_cryptorand(uint8_t *out, size_t n);
+JANET_API int janet_cryptorand(uint8_t *out, size_t n);
 
 /* Marshal API */
 JANET_API void janet_marshal_size(JanetMarshalContext *ctx, size_t value);