diff --git a/modules/openthread/platform/crypto_psa.c b/modules/openthread/platform/crypto_psa.c
index 6ad286f3734..bab1afbd7e9 100644
--- a/modules/openthread/platform/crypto_psa.c
+++ b/modules/openthread/platform/crypto_psa.c
@@ -226,7 +226,7 @@ otError otPlatCryptoHmacSha256Init(otCryptoContext *aContext)
 	}
 
 	operation = aContext->mContext;
-	*operation = psa_mac_operation_init();
+	memset(operation, 0, sizeof(*operation));
 
 	return OT_ERROR_NONE;
 }
@@ -347,7 +347,7 @@ otError otPlatCryptoSha256Init(otCryptoContext *aContext)
 	}
 
 	operation = aContext->mContext;
-	*operation = psa_hash_operation_init();
+	memset(operation, 0, sizeof(*operation));
 
 	return OT_ERROR_NONE;
 }