diff --git a/ESPGeiger/src/GRNG/sha256.h b/ESPGeiger/src/GRNG/sha256.h
index de4307c..4b45105 100644
--- a/ESPGeiger/src/GRNG/sha256.h
+++ b/ESPGeiger/src/GRNG/sha256.h
@@ -7,11 +7,7 @@
 #define HASH_LENGTH 32
 #define BLOCK_LENGTH 64
 
-#ifdef ESP8266
-  #define WRITE_RET_TYPE size_t
-#else
-  #define WRITE_RET_TYPE void
-#endif
+#define WRITE_RET_TYPE size_t
 
 union _buffer {
   uint8_t b[BLOCK_LENGTH];