diff --git a/src/cardano.h b/src/cardano.h
index 4f2e7f11..c2514911 100644
--- a/src/cardano.h
+++ b/src/cardano.h
@@ -3,6 +3,7 @@
 
 #include "common.h"
 #include "bip44.h"
+#include "keyDerivation.h"
 
 // Just a trick to make the numbers readable
 #define __CONCAT4(A,B,C,D) A ## B ## C ## D
@@ -23,7 +24,6 @@ STATIC_ASSERT(LOVELACE_MAX_SUPPLY < LOVELACE_INVALID, "bad LOVELACE_INVALID");
 #define SCRIPT_HASH_LENGTH 28
 #define SCRIPT_DATA_HASH_LENGTH 32
 #define OUTPUT_DATUM_HASH_LENGTH 32
-#define VKEY_LENGTH 32
 
 #define MINTING_POLICY_ID_SIZE 28
 #define ASSET_NAME_SIZE_MAX 32
diff --git a/src/keyDerivation.h b/src/keyDerivation.h
index e7b72d36..04f22726 100644
--- a/src/keyDerivation.h
+++ b/src/keyDerivation.h
@@ -5,7 +5,6 @@
 #include "handlers.h"
 #include "bip44.h"
 
-
 #define PUBLIC_KEY_SIZE      (32)
 #define CHAIN_CODE_SIZE      (32)
 #define EXTENDED_PUBKEY_SIZE (CHAIN_CODE_SIZE + PUBLIC_KEY_SIZE)
diff --git a/src/signTx.c b/src/signTx.c
index 2bfeffd2..e195f363 100644
--- a/src/signTx.c
+++ b/src/signTx.c
@@ -1830,8 +1830,8 @@ static void signTx_handleRequiredSignerAPDU(uint8_t p2, uint8_t* wireDataBuffer,
 		TRACE_BUFFER(wireDataBuffer, wireDataSize);
 
 		read_view_t view = make_read_view(wireDataBuffer, wireDataBuffer + wireDataSize);
-		STATIC_ASSERT(SIZEOF(BODY_CTX->stageData.requiredSigner) == VKEY_LENGTH, "wrong vkey length");
-		view_copyWireToBuffer(BODY_CTX->stageData.requiredSigner, &view, VKEY_LENGTH);
+		STATIC_ASSERT(SIZEOF(BODY_CTX->stageData.requiredSigner) == PUBLIC_KEY_SIZE, "wrong vkey length");
+		view_copyWireToBuffer(BODY_CTX->stageData.requiredSigner, &view, PUBLIC_KEY_SIZE);
 		VALIDATE(view_remainingSize(&view) == 0, ERR_INVALID_DATA);
 	}
 
diff --git a/src/signTx.h b/src/signTx.h
index bd6c19a4..7e854839 100644
--- a/src/signTx.h
+++ b/src/signTx.h
@@ -134,7 +134,7 @@ typedef struct {
 		uint64_t validityIntervalStart;
 		uint8_t scriptDataHash[SCRIPT_DATA_HASH_LENGTH];
 		sign_tx_transaction_input_t collateral;
-		uint8_t requiredSigner[VKEY_LENGTH];
+		uint8_t requiredSigner[PUBLIC_KEY_SIZE];
 	} stageData; // TODO rename to reflect single-APDU scope
 
 	union {
diff --git a/src/txHashBuilder.c b/src/txHashBuilder.c
index 2be62ac5..782147d9 100644
--- a/src/txHashBuilder.c
+++ b/src/txHashBuilder.c
@@ -1355,7 +1355,7 @@ void txHashBuilder_addRequiredSigner(
 	//    Unsigned[index]
 	// ]
 	{
-		ASSERT(vkeySize == VKEY_LENGTH);
+		ASSERT(vkeySize == PUBLIC_KEY_SIZE);
 		BUILDER_APPEND_CBOR(CBOR_TYPE_BYTES, vkeySize);
 		BUILDER_APPEND_DATA(vkeyBuffer, vkeySize);
 	}