diff --git a/wolfssl/wolfcrypt/settings.h b/wolfssl/wolfcrypt/settings.h
index e4675552e..3c3782647 100644
--- a/wolfssl/wolfcrypt/settings.h
+++ b/wolfssl/wolfcrypt/settings.h
@@ -1559,7 +1559,8 @@ extern void uITRON4_free(void *p) ;
     #define NO_WOLFSSL_DIR
     #define NO_WRITEV
 
-    #if ! defined(WOLFSSL_SILABS_SE_ACCEL) && !defined(CUSTOM_RAND_GENERATE)
+    #if !defined(WOLFSSL_SILABS_SE_ACCEL) && !defined(STM32_RNG) && \
+        !defined(CUSTOM_RAND_GENERATE)
         #define CUSTOM_RAND_TYPE     RAND_NBR
         #define CUSTOM_RAND_GENERATE Math_Rand
     #endif