diff --git a/wolfssl/wolfcrypt/random.h b/wolfssl/wolfcrypt/random.h
index a447266b7..b4e301df9 100644
--- a/wolfssl/wolfcrypt/random.h
+++ b/wolfssl/wolfcrypt/random.h
@@ -103,6 +103,9 @@
     #ifdef NO_SHA256
         #error "Hash DRBG requires SHA-256."
     #endif /* NO_SHA256 */
+    #ifdef WOLFSSL_SMALL_STACK_CACHE
+        #include <wolfssl/wolfcrypt/sha256.h>
+    #endif
 #elif defined(HAVE_WNR)
      /* allow whitewood as direct RNG source using wc_GenerateSeed directly */
 #elif defined(HAVE_INTEL_RDRAND)