diff --git a/Include/Acidanthera/Library/OcCryptoLib.h b/Include/Acidanthera/Library/OcCryptoLib.h
index 77310e06725f..8e0bb519bd51 100644
--- a/Include/Acidanthera/Library/OcCryptoLib.h
+++ b/Include/Acidanthera/Library/OcCryptoLib.h
@@ -435,7 +435,7 @@ VOID
 Streebog256 (
   CONST UINT8  *Data,
   UINT8        *Digest,
-  UINTN        Length
+  UINT32       Length
   );
 
 VOID
@@ -460,7 +460,7 @@ VOID
 Streebog512 (
   CONST UINT8  *Data,
   UINT8        *Digest,
-  UINTN        Length
+  UINT32        Length
   );
 
 BOOLEAN
diff --git a/Library/OcCryptoLib/Streebog.c b/Library/OcCryptoLib/Streebog.c
index b5195ecc34f7..64f266950d54 100644
--- a/Library/OcCryptoLib/Streebog.c
+++ b/Library/OcCryptoLib/Streebog.c
@@ -322,7 +322,7 @@ VOID
 Streebog256 (
   CONST UINT8  *Data,
   UINT8        *Digest,
-  UINTN        Length
+  UINT32       Length
   )
 {
   STREEBOG_CONTEXT  Context;
@@ -364,7 +364,7 @@ VOID
 Streebog512 (
   CONST UINT8  *Data,
   UINT8        *Digest,
-  UINTN        Length
+  UINT32       Length
   )
 {
   STREEBOG_CONTEXT  Context;